This listing is for 2x thumb screw for gopro the phot r thumb screw for gopro hero allows you to attach your gopro hd hero to any gopro accessory that accepts the thumb screw it is one of the essential pieces of gopro equipment keep spares around or purchase to replace lost thumb screws the thumb screw is great to have on hand if you are gathering footage for motor sports aviation biking diving fishing hiking kayaking military use motocross radio control rock climbing skateboar