TR8x2:2mm pitch, 2mm of linear movement per rotation. 8mm wide TR8x4:2mm pitch, 4mm of linear movement per rotation. 8mm wide TR8x8:8mm pitch, 8mm of linear movement per rotation. 8mm wide TR8x2/TR8x4/TR8x8 lead screw Anti-Backlash Nut TR8 elimination gap nut ACME steel Anti-Backlash Nut 3D printer CNC DIY parts Item specifics:Model number: TR8Item type: Lead Screw