Materials: Lever: Zinc die cast, with wear-resistant epoxy resin coating, black matt. Grub screw: Zinc-plated steel, chromated. Support washer: Thermoplast, glass-fibre reinforced, black matt. Non-adjustable support washer. The clamping force, can either be set on the lever side by turning the lever, or on the backside by adjusting the nut/knurled nut if present. For rapid clamping and loosening by hand. Clamping is made without generating a torque. Clamping force is up to 8 kN.