Material: Stainless steel lead screw / Anti-Backlash NutScrew diameter:8mmPitch:2mmLead of thread:8mmLength:200mm/300mm/400mm/500mmRange: Reprap makerbot 3d printer accessories Package list: 1x 200mm/300mm/350mm/400mm/500mm Lead Screw 1x Anti-Backlash Nut Item specifics:Item type: Lead ScrewModel number: Lead Screw