1. Stainless steel lead screw + brass nut, rustproof and long service life. 2. 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, , 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: . 8mm/0.32 inch Pillow Flange Outer diameter: . 27mm/1.1 inch Pillow Flange Length: . 48mm/1.9 inch Pillow Flange Height: . 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 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.