Plastic Knuckles Size Guide

ONE SIZE FITS NOBODY.

NoMetalKnucks products come in actual sizes because hands do too. Choose the profile you want, download the correct printable guide, and check the scale before choosing Small, Medium, Large, or X-Large.

Ergo and Classic share one four-finger guide. Single uses a separate one-finger guide.

Download the printable guides

Print at 100%

Both current PDFs give the same accuracy instructions:

  1. Print the page at 100% in your printer settings.
  2. Place a U.S. quarter over the printed quarter image.
  3. The quarter should not cover the red border.
  4. If it covers the border, the page scale is wrong and the measurement will be inaccurate.

Do not use “Fit to Page,” shrink the PDF, or enlarge it.

Choose the profile first

Ergo Knuckle 2

Our fuller, contoured four-finger profile. Use the shared Ergo and Classic printable guide.

View Ergo Knuckle 2

Classic Knuckle

Our straighter, flatter four-finger profile. Use the shared Ergo and Classic printable guide.

View Classic Knuckle

Single Knuck

Our compact one-finger profile. Use the separate Single printable guide—not the four-finger guide.

View Single Knuck

Current published dimensions

The current dimension chart shows:

Size Finger opening Overall height Overall width Thickness
Small 0.823 in / 2.09 cm 3.949 in / 10.03 cm 2.293 in / 5.82 cm 0.592 in / 1.50 cm
Medium 0.917 in / 2.33 cm 4.388 in / 11.15 cm 2.425 in / 6.16 cm 0.647 in / 1.64 cm
Large 1.017 in / 2.58 cm 4.819 in / 12.24 cm 2.642 in / 6.71 cm 0.706 in / 1.79 cm
X-Large 1.119 in / 2.84 cm 5.258 in / 13.36 cm 2.852 in / 7.24 cm 0.766 in / 1.95 cm

The live chart marks Large as the general recommendation. That does not mean Large fits every hand. The popup recommends sizing up when you are between sizes.

NoMetalKnucks Small through X-Large dimension chart

Between sizes?

If your hand falls between sizes, the current product popup recommends sizing up. If the choice is still unclear, contact NoMetalKnucks and include the profile and size you are considering.

Ask A Sizing Question

Quick reminder

  1. Choose Ergo, Classic, or Single.
  2. Download the correct PDF.
  3. Print at 100%.
  4. Verify the scale with a U.S. quarter.
  5. Compare your hand with the guide.
  6. Size up if you are between sizes.

Two minutes now beats an exchange later.