1. Stainless steel lead screw + brass nut, rustproof and long service life. 2. Smooth moving, low friction, high rigidity and long working life. 3. 3D engraving machine lead screw 200mm length with nut. 4. Applies to: Widely used in 3D Printer, stepper motor, machine tools, and other equipment. Color: Silver + Gold + Grey Specification: Screw Material: Stainless Steel Nut Material: Brass Diameter: 8mm/0.31in Nut Diameter: 22mm/0.86in Length:200mm/7.87in Lead: 2mm/0.078in (nut revolution movement 2mm) Type: Vertical Lead Screw's Lead: 2mm Pillow Flange Inner diameter: approx. 8mm/0.32 inch Pillow Flange Outer diameter: approx. 27mm/1.1 inch Pillow Flange Length: approx. 48mm/1.9 inch Pillow Flange Height: approx. 12mm/0.48 inch Weight: 228g Package Include: 1* lead screw 1* nut 1* flexible coupling 2* bearing block mounting bearings Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.