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Specifications: Material: Stainless steel lead screw, copper nut Screw diameter: 8mm Length: 400mm Screw spacing: 2mm Lead of thread:8mm Range: Reprap makerbot 3d printer accessories 3D engraving machine lead screw 400mm length with nut. Nut turn an around move 8mm Package include: 1x 400mm lead screw 1x Brass Nut 1x Kraft paper boxes Please Notice: CTYRZCH is a registered trademark in the United States. CTYRZCH only authorized to TranCh, other shops are selling fake and shoddy products, we can not guarantee the quality of products from other shops. Please check that the product you purchased is from TranCh when you are ready to pay, very grateful!