Product With Q-lock anti-theft complicates the MAXImum height for the thief! The Black anodised guard made of aluminum easily applied to existing fasteners, and can not be removed without being destroyed. Q cap works both for screws and nuts (up to M8) and applications are endless protect and to prevent theft of your LED light bar, strobe ramp and other equipment. Mounting Mounted to the existing screw or nut. The cap turned into the housing, eg with a rubber mallet (partially fixed data are needed, the substrate must not sag too much). Specification Size: diameter x height = 29 x 15mm. Diameter inside = 20mm. Hexagon bolt or nut up to M8. Quantity: 2 pieces complete Q-lid packaging material: Aluminum Color: cover Black finish