Condition: Professional chin strap buckle for any helmet A safe, fast and convenient way to securing your helmet Speed clip, quick release install to your helmet Material: Plastic Color: Black+Red Dimensions: 6*2.6*1.2cm Instructions: Fix part A. Take one side of your helmet's strap through the big hole of part A and come the metal stick in the middle,pull the strap out of the big hole from the bottom. Sew part B. You need to sew D ring of part B to the other side of your helmet's strap. 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 showing in part B. Package Contents: 1 x Motorcycle Helmet Plastic Pull Buckle Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed is +/- 1-3cm.