Pinhen Aluminum ThumbScrew and Wrench Set for Gopro Hero4, Session, Hero3+ Hero3 Hero2 , SJ4000, SJ5000 Camera (ThumbScrew Set Blue) Billet Aluminum Thumbscrew, High quality stainless Steel Acorn Nut Direct replacement for GoPro Hero4 Hero2,Hero3, Hero3+, replace the plastic thumbscrew Rubber ring is for preventing abrasion, yet not a must for all so put it away when you don't need it screw+ blue wrench. The length of Thumbscrew is about 2.2inches LONG AND SHORT SCREWS INCLUDED: The long screw used for attaching your GoPro housing to a mount - the screw is placed just below the case. The short screws are for attaching extension arms or base mounts.