The Arisaka Stop was developed as a low profile, minimal control accessory. Unlike a hand/stop, which most people position at the rear of their support hand, the Finger/Stop has a rounded profile which is ergonomically designed to be located between your index and middle fingers. This typically places it further forward on the guard, which also means it doesn't get in the way when transitioning to kneeling or prone positions, where most people move their support hand towards the rear. Additionally, the Stop functions well as a forward limit to prevent your hand from slipping off shorter guards onto a hot barrel or can, and as a barricade rest. Height: 0.85" Width: 0.50" Weight: 0.4 oz CNC machined from 6061 aluminum and type III hard coat anodized. Product includes mount and M-Lok nut/screw. Other accessories shown in above product photos are not included.