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Features: Copper nut, with 4 holes for fixing to the machine Nut turn an around move 2mm Screw nut made of copper,durable and wear-resisting Used on stepping motor driving guide rail,machine tool, and other equipment. Fit for 3D printers, engraving machine, etc... Specification: Material: Stainless Steel Lead Screw; Copper Nut Pitch: 2mm; The Lead of Thread: 2mm Lead Screw: Diameter: 8mm; Length: 400mm Copper Nut: Height: 10.5mm; Diameter: 22mm; Hole Threaded: M3; Hole Center Distance (Diagonal): 16mm Total Weight: 146g Package include: 1 x Lead Screw 1 x Copper Nut