Stainless steel material, anti-corrosion and high temperature resistance. T8 trapezoidal threaded, uniform force and smooth slide. Suitable for 3D printer stepper motor. Type: Lead Screw Rod Material: Stainless Steel Features: High Temperature Resistant, Acme Threaded, with Nut Length: 150mm/5.91", 200mm/7.87", 250mm/9.84", 300mm/11.81", 400mm/15.75", 500mm/19.69" (Approx.) Diameter: 8mm/0.3& 39;& 39; (Approx.) Brass Nut Size: 10mm x 13mm x 22mm/0.4& 39;& 39; x 0.5& 39;& 39; x 0.9& 39;& 39; (Approx.) Notes: Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Lead Screw Rod 1 x Nut