The Sniper Clamp incorporates the new & enhanced " Alcatraz" locking system that uses 16 locking increments for ultra-fine compression adjustments & an M6 locking bolt so you can use the same tool for all bolts. Features One Piece 6061-T6 Aluminium Alloy Exclusive " Alcatraz" Locking system 90mm High for extra clamping & support Filleted to Minimise weight Smooth matt anodised finish with laser etched logos 4 Bolt design Complete with shim for oversized & standard sized bars