10Pcs 1000mm Aluminum Extrusion Standard Linear Rail for 3D Printer Part And DIY
Size： 20mm 20mm 1000mm with 10pcs. It can be fixed on the side of 4 grooves such as M3, M4, M5 T-slot nut and pulley. 【Professional】Made of 6063-T5 material, the V-slot has smooth edges，suitable for your DIY project.