This Forward Mount is a hinged handlebar mount featuring a stiff and durable composite matrix construction with secure X-Lock and an integrated rubber shim. Pressed in stainless steel nut and 3 mm hex stainless steel bolt, this mount's sleek, lightweight design positions the GPS computer in front of the stem for better visibility and improved aerodynamics. The X-Lock is a secure and reliable mounting feature integrated into the Standard GPS Mount and the Forward GPS Mount. I safely locks in the computer for worry-free riding over any type of terrain. Fits 31.8 handle bars.