Low Cost Quality CNC 495 mm X M8 Stainless Steel Lead Screw & Anti-backlash Delrin Nut Block - 2 Sets Polished 495 mm x M8 stainless steel leadscrew M8 1.25 mm pitch anti-backlash delrin nut block No lubrication neccessary - will not corrode Nut dimensions 35 mm x 31 mm x 13 mm Convenient mounting with 2 hole fixing