Lead Screw Diameter: 8mm Pitch: 2mm Lead of thread: 8mm two small M3 holes centre distance is 17.5mm 8mm lead T8 lead screw is with 4 starts. Color: Gold Material: Brass Package Contents: 8 * Anti-backlash nut Only the above package content, other products are not included. Note: Light reflection 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.