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Features : 1. Perfect for your DIY CNC routers, mills, lathes 2. Strong and durable 3. the tool is simple & easy to use. 4. Strong practicability 5. High performance price ratio Specifications Screw Length 500mm/1000mm Screw Diameter 12mm Pitch 2mm Color Silver Material Stainless steel(lead screw)and copper(nut) Weight 443g/847g Package Included: 1 x Trapezoidal ACME Lead Screw