Material: The clamp is made of zinc aluminum alloy for long life and high wear resistance. Dimensions: The workpiece holder measures 50 mm (L) x 20 mm (W) x 56 mm (H). DESIGN: The size of the clamping slot block is designed for Genmitsu 3018 series CNC milling machines. It fits perfectly with 3018 series desktop CNC milling machines. FEATURES: The clamp absorbs material up to a thickness of less than 30 mm. It can hold most of the material for desktop CNC milling machines. VERSATILITY: This clamp provides a unique clamping effect for your universal T-slot system setups and assemblies. It is ideal for holding, positioning and fixing workpieces in woodworking or metalworking, in combination with milling machines, drilling machines, CNC milling/engraving machines, workbenches, vertical milling machines and much more. Product description Technical details: Material: Zinc aluminum alloy. Dimensions: 50 mm (L) x 20 mm (W) x 56 mm (H) (Assembled). Package contents: 4 x T-slot clamps.