Condition: Professional chin strap buckle for any helmet A safe, fast, and convenient way to secure your helmet Speed clip, quick release Easily installs to your helmet Material: Plastic Color: Black + Red Dimensions: 6 x 2.6 x 1.2 cm Instructions: Fix part A. Take one side of your helmet's strap through the big hole of part A and pass it across the metal stick in the middle, then pull the strap out of the big hole from the bottom. Sew part B. Sew the 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. Release the clip by pulling the red button as indicated by the arrow on part B. Package Includes: 2 x Motorcycle Helmet Plastic Pull Buckle Note: Light and different displays may cause the color of the item in the picture to be slightly different from the actual item. Measurement allowance is +/- 1-3 cm.