Material: plastic+Metal Color: Black+Red Dimensions: 2.44X1.10X0.43 inch Professional chin strap buckle for any helmet A safe, fast and convenient way to securing your helmet Speed clip, quick release Easily install to your helmet Instructions: 1.Fix part A. Take one side of your helmets strap through the big hole of part A and come across the metal stick in the middle,pull the strap out of the big hole from the bottom. 2.Sew part B. You need to sew D ring of part B to the other side of your helmets strap. 3.Clip the male connector of part A to the female connector of part B,you can release the clip by pull the red button as arrow showing in part B. Package Includes: 5 x Motorcycle Helmet Plastic Pull Buckle Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.