K3 Basic Pliers & Plastic Snaps Starter Kit

Size Guide
Choosing the Right Plastic Snap Size

Snaps are not one-size-fits-all.  If your snaps are too long for your fabric, they won't close properly.  If they're too short, they'll fall off. For this reason, it's important to choose the proper size / length for your material.

Which size works best for you will depend on a number of variables, such as the fabric you are using, its density and compression levels, how hard you are able to press, and your own personal preference.  For these reasons, we are unable to provide specific size recommendations for every scenario. 

------>>>>>> Download a printable pdf file showing each snap in its true-to-life size.

Plastic KAM Snaps Fasteners Size Comparison Chart - What Size Snaps Do I Have?


Dimensions of Size 20 Snap Parts


The 3 most commonly used sizes, in the order of popularity, are:

    1. Size 20 regular length
    2. Size 20 extra long (for thicker material)
    3. Size 16 regular length (for thinner material)

Size 20 (12.4mm or 1/2" cap diameter)

  • Size 20 Regular Length (5.6mm prong) is often used for lightweight to mid-weight fabric that isn't prone to tearing including baby diapers, menstrual pads, bibs, regular clothing, and household projects.   This is the most popular size of plastic snaps and is a good size to start with for most projects since most commonly used fabric fall within the desired thickness for this length. This size has a strong grip so if you're working with more delicate fabric at risk of tearing, consider size 16.

    ------>>>>>> Click here for sizing tips for baby & toddler clothing.
  • Size 20 Extra Long (6.2mm prong) is recommended for slightly thicker & denser material like double layers of standard marine vinyl for key fobs, medium weight leather, and chinese prefold diapers. (Some versions of these material may be so thick that they'll need larger/longer snaps.)

Size 16 (10.7mm or 7/16" cap diameter)

  • Size 16 Regular Length (4.6mm prong) is most commonly used for  projects that require a looser grip, such as doll clothes or reinforced stretch jersey.
  • Size 16 Extra Long is available in lengths ranging from 5.2mm - 7.2mm long for thicker material.

Size 22 (14.1mm or 9/16" cap diameter, 7.0mm prong)

  • A larger snap which can be used in similar situations as size 20 long-prong, or in situations where size 20 long-prong is still a little too short.

Size 24 (14.8mm or 9/16" cap diameter, 7.5mm prong)

  • Our largest, strongest snap which should only be used in very heavy duty applications with thicker material such as canvas tote bags, nylon webbing, dense leather and thick jackets. Because the grip is so strong, it can tear through more commonly used fabric.

This kit includes everything you need to get started.

  • K3 basic pliers to install plastic snaps.
  • Dies for size 20, 22, 24, hearts, flowers, butterflies, stars. Cannot install size 16 or smaller snaps.
  • 250 sets of multi-color size 20 regular length plastic snaps (for most light to mid-weight fabrics)
  • Hand awl to pierce holes in fabric for snap placement, and screwdriver
  • Storage / organizer box *not* included.

Snap Colors (10 sets x 25 colors): B3 White, B5 Black, B7 Yellow, B8 Bright Blue, B10 Sunset Yellow, B13 Medium Silver, B14 Spring Green, B16 Royal Blue, B17 Coral, B18 Pastel Pink, B28 Dark Lavender, B33 Azalea Pink, B37 Creamy White, B40 Pumpkin, B41 Violet, B44 Apple Green, B46 Teal, B47 Neon Pink, B48 Blue Bell, B51 Kelly Green, B54 Crimson, B56 Bright Violet, B57 Medium Pink, B58 Light Navy, B59 Pool Blue

Specifications (approximate):

  • Height: 6", Length: 6 1/2", Width: 3/4", Weight: 9 oz
  • Fabric Reach: 3/4"


  • Cannot be expanded for other fasteners
  • Intended for low-volume, occasional personal use
  • Results may not be as uniform or professional-looking compared to our multi-functional presses
  • Medium grip strength required
Disclosures: Pliers are manufactured in a factory specializing in heavy, industrial equipment and as a result, may have minor cosmetic imperfections that will not hinder their function. Returns or exchanges cannot be accepted unless a defect affects function.

How to Attach Plastic Snaps

Customer Reviews

Based on 8 reviews
Fjorlief Inhaga
exceeds my hopes!!

I had my fingers crossed that the KamSnaps setting pliers kit would be something I could use in my sewing projects. I have small hands with short fingers, and I was delighted to find that despite this difficulty, the pliers were designed to be used even by a small woman without a lot of hand strength! I followed the directions, and the snaps were set into the fabric perfectly. I'm looking forward to finding new projects that I can add snaps to, and would recommend this tool to anyone. 10/10

Awesome tool!

I am impressed with my K3 pliers and snaps. I really like the floral design!

Happy snapper
Great product!

Works just as described. Highly recommend it

New customer
Hard to open

Unfortunately the snaps are so tight after installed that they are impractical to use. Easy to install, good delivery, lots of colors, but I break a nail opening one every time. Alas.

Although the fabric does not change the strength of the snap, thin layers of fabric will make it *feel* like the snaps are stronger & harder to open as opposed to using them on thicker/denser layers. Most people use size 20 plastic snaps exclusively, but you may want to consider size 16 snaps which are smaller and have a gentler grip compared to the more popular size 20 snaps.

Heather K
Just what I wanted!

Wanted something other than Velcro to use in my small sewing projects. Excited about this new tool/toy.

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