KC?s LKZ Light Lock accessory line provides peace of mind to consumers wary of potential theft of their lighting investment. With our 100% CNC machined steel construction and anti-corrosive Zinc coat, KC light locks are designed to last, keeping your light investment safe for many years to come.100% CNC Machined Steel ConstructionClear Zinc Coat Plated Finish for long-lasting Corrosion ProtectionDiameter Thread Size: M12-1.75mmKit Includes (2) M12-1.75 specific Security Nuts and (1) Key Each Tube Clamp Mount comes complete with rubber shims for a fine tune fitment of lights, securely attaching your lights with a range of adjustability for your lighting needs. Forget rust-prone steel, KC HiLiTES has constructed.