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Made from qualified stainless steel, hardness and anti-rust. Pure copper screw nut is durable and wear-resisting. Complete L thread, smoothy slide. Easy to install and convenient to use. Fit for 3D printers, engraving machine, etc. Descriptions: Exquisite workmanship ensure its high performance. Fine producing and practical. Suitable for stepping motor driving guide rail,machine tool, and other equipment. Specifications: Material: Stainless steel lead screw, copper nut The Lead screw diameter: 8mm The Screw pitch: 2mm The Lead of thread: 8mm The Lead screw length: 300mm Package included: 1 x T8 Lead Screw 1 x Copper Nut