If you have ever looked at dog grooming blades and wondered what 3W, 4W, 5W, 7W or 30W actually mean, you are not alone.
Choosing the right clipper blade size and comb attachment can seem confusing at first, but the basic idea is surprisingly simple.
The main questions are:
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How long do you want to leave the coat?
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Do you want to clip directly with a blade?
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Or do you want the flexibility of using attachment combs?
Here is our simple guide to choosing the right wide grooming blade and comb combination.
What Is a Wide Dog Grooming Blade?
A wide grooming blade works similarly to a standard detachable clipper blade, but it covers a larger area with each pass.
That can make wide blades particularly useful for full-body dog grooming, larger dogs and larger areas of coat, where groomers want to work efficiently.
Simply put:
Wider blade = more coat covered with each pass.
Comparable professional wide-blade systems are specifically designed to reduce the number of passes needed across larger areas.
What Do 3W, 4W, 5W and 7W Mean?
Here's the most important rule to remember:
The lower the blade number, the longer the coat left behind.
So, within our wide blade range:
| Wide Blade | Finish |
|---|---|
| 3W | Longest finish |
| 4W | Longer finish |
| 5W | Medium finish |
| 7W | Shorter finish |
| 30W | Very close cut / used with comb attachments |
That means a groomer wanting to leave more coat may reach for a 3W or 4W, while someone wanting a shorter finish may choose a 5W or 7W.
Professional equivalent wide blades show the same progression: a 4FW typically leaves around 9.5 mm, a 5FW around 6.3 mm and a 7FW around 3.2 mm.
The final result can also vary depending on coat type, preparation and the direction in which you clip.
So Which Wide Blade Should I Choose?
Think about the finished coat rather than simply the blade number.
3W – For a Longer Finish
The 3W wide blade is the longest option in our current wide blade range.
It can be useful when you want the speed and coverage of a wide blade while still keeping plenty of length on the dog.
4W – Long but More Manageable
The 4W blade gives a slightly shorter finish.
This can be a useful option for groomers who want a longer full-body groom without moving straight to attachment combs.
5W – A Versatile Medium Finish
The 5W wide blade sits comfortably in the middle.
It is a useful choice when you want a neat, practical finish while still leaving visible coat.
7W – For a Shorter Groom
The 7W blade gives a noticeably shorter finish.
It is designed for groomers who want to remove more length efficiently while still benefiting from the extra coverage of a wide blade.
Sharperedges currently offers 3W, 4W, 5W and 7W blades individually, as well as a 4FW + 5FW + 7FW wide blade bundle.
What Is a 30W Blade Used For?
This is where things become really useful.
A 30W blade cuts extremely close, but many groomers use it as a base blade for wide attachment combs.
Instead of buying a different blade for every coat length, you can attach different comb sizes over your 30W blade.
Comparable professional #30W blades are also specifically recommended as a base for wide attachment combs.
That gives you far more flexibility from one blade.
How Do Wide Comb Attachments Work?
The comb sits over the 30W blade and determines how much coat you leave behind.
Sharperedges wide comb attachments are designed to fit our #30 wide blade and currently come in:
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6 mm
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10 mm
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13 mm
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16 mm
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19 mm
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22 mm
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25 mm
The principle is very simple:
30W blade + shorter comb = shorter finish
30W blade + longer comb = longer, fluffier finish
So if you regularly groom dogs at many different lengths, a 30W blade with several comb attachments can give you a very flexible setup.
Blade or Comb Attachment: Which Should You Use?
There isn't one correct answer.
It depends on the groom you are trying to create.
Choose a wide blade when:
You already know the approximate length you want and prefer clipping directly with the blade.
For example:
Longer → 3W or 4W
Medium → 5W
Shorter → 7W
Choose a 30W + comb when:
You want more flexibility.
One 30W blade can be combined with several comb lengths, allowing you to switch between different finishes throughout your working day.
This can be particularly useful if your appointments include different breeds, coat types and customer length preferences.
Which Blade and Comb Combination Should I Buy?
Here is the easiest way to choose.
I Prefer Grooming Directly With Blades
Build a selection of:
4W + 5W + 7W
This gives you three useful cutting lengths covering longer, medium and shorter grooms.
Sharperedges also offers these together as a Wide Blade Bundle.
I Want One Blade With Several Length Options
Start with:
30W + 10 mm + 13 mm + 16 mm combs
These are some of the most useful middle-range attachment sizes and Sharperedges currently offers this exact combination as a bundle.
I Want Maximum Choice
Choose:
30W + full wide comb attachment set
The full Sharperedges set contains:
6 mm + 10 mm + 13 mm + 16 mm + 19 mm + 22 mm + 25 mm.
That gives you seven different coat-length options using the same 30W base blade.
I Want a Complete Wide-Blade Kit
Combine both systems:
3W / 4W / 5W / 7W for direct clipping
plus
30W + attachment combs for additional lengths.
This gives you the flexibility to choose the tool that suits each groom rather than trying to make one blade work for everything.
Are Sharperedges Wide Blades A5 Compatible?
Sharperedges' 3W, 4W, 5W, 7W and 30W blades are currently listed as A5 Universal Fit blades made from Japanese high-carbon steel.
Always check your clipper's blade system before purchasing.
Quick Grooming Blade Size Guide
Still unsure?
Remember this:
3W → longest
4W → long
5W → medium
7W → short
30W → very short / base blade for wide combs
And with comb attachments:
6 mm → shortest comb
↓
10 mm
↓
13 mm
↓
16 mm
↓
19 mm
↓
22 mm
↓
25 mm → longest comb
Once you understand that system, choosing your dog grooming blade sizes becomes much easier.
Frequently Asked Questions About Dog Grooming Blades
What does W mean on a dog grooming blade?
The W identifies a wide-style blade, designed to cover more coat than a standard-width equivalent.
Is a higher blade number longer or shorter?
Generally, higher blade numbers cut shorter.
For example, a 7W gives a shorter finish than a 4W.
What blade should I use with wide attachment combs?
Sharperedges wide comb attachments are designed specifically to fit the Sharperedges #30 wide blade.
Do I need every grooming blade size?
Not necessarily.
Some groomers prefer several direct-cutting blades. Others prefer a 30W blade and multiple attachment combs.
Many professional groomers benefit from having both options available so they can choose according to the dog, coat and desired finish.
Build the Wide Blade Combination That Works for You
Every groom is different — and that is exactly why having different blade and comb options matters.
Whether you prefer the simplicity of a 3W, 4W, 5W or 7W blade, the versatility of a 30W with attachment combs, or a combination of both, you can build a grooming kit around the lengths you use most.
Explore our Wide Blades, Wide Comb Attachments and Blade & Comb Bundles to create the combination that suits your grooming table.