brand new and high quality Material: stainless steel lead screw, copper nut Color: as shown in pic Specification: Screw diameter: approx. 8mm Length: approx. 100mm/ 200mm/300mm / 400mm /500mm/ 600mm Screw spacing: approx. 2mm Lead of thread: approx. 8mm Range: 3D printer accessories, stepper motor We provide 9 kinds of specifications for you, there are 100mm - 600mm, there have same lead of thread(8mm) which is the distance of the nut to rotate a circle Suitable for: industrial automation equipment, stepper motor rails; such as 3D printers; engraving machine; XYZ module; slider; lifts, etc Quantity: 1 Pc Due to the difference between different monitors, the picture may not reflect the actual color of the item. please allow 1-2CM differs due to manual measurement, thanks