This J-Hook Buckle can be used with flat surfaces,especially helmet and chest beltCamera by holding your Hero Series and making your usage convenient.Made of metalEasy operation, easy to install and removeLink with waterproof shell, bicycle, etc Used for SJ400 Car DVR and outdoor sports camera, Accessories kits compatible for HERO 5/3/3+/4/Hero5 Black/Hero 4 Black and Sliver/Hero 2 , Style cameras ,like m1/ 4k/ 4K plus/ SJ4000/SJ4000 WIFI/SJ4000 Plus/SJ5000 series/SJ6000/SJ7000/SJ8000/SJ9000 SJ7/0SJ6/SJ7 star/SJ8000/SJ9000/m10/m20 mount, Accessories for H9/h9r and other name action cameras6Functions Can connect with related accessories, such as waterproof caseCan install to the bicycle7This accessories can used to fix helmet/surfboard/chest strap and other sports ,give you more anglecolor: blackPackage Contents:1 x J-shaped buckle,1 x Long screws + nuts1 x Flat Base1 x Activities base1 x 3 to adjust the arm1 x Fixed rope( Not include other product)Only the above package content, other products are not included.Note: Light 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.