10pcs 1M Aluminum Extrusion European Standard Anodized Linear Rail (39.4inch)
It can be fixed on the side of 4 grooves such as M3, M4, M5 T-slot nut and pulley. Size： 20mm 20mm 1000mm with 10pcs. Material:Anodized 6063-T5 Material. Section size:20 20mm.