This Crux Ordnance clamp securely holds on to your gun/rifle. Mounted via Nato rail to the Support System. The Clamp as well as other parts are made of hard anodized, scratch-resistant 6061 aluminum alloy and CNC precision machined parts in the USA. Features over-sized knobs for ease of operation. Features: Rubberized knobs for ease of adjustmentHard anodized scratch resistant finishCNC Precision machined partsRubber pads will securely hold the gun without scratching it Crux Ordnance Clamp CO-004