Linear Guide Shaft Uxcell 8mm X 501mm Hardened Rod Chrome Plated Linear Motion Shaft/Guide 501mm Chrome Plated Rod Specification:Size: 8mm x 501mmMaterial: Surface chrome plated Threaded Rods & Studs Uxcell 8mm X 501mm Hardened Rod Chrome Plated Linear Motion Shaft/Guide 8mm Shaft Linear Motion Rod Shaft Guide D 8mm x L 29.53 inch / 750mm 2Pcs, Hollow Diameter 8mm, tolerance -0.005mm to -0.03mm ( 7.995mm - 7.97mm) Length 150mm, tolerance ± 0.5mm ( 149.5mm - 150.5mm Chrome plated for corrosion resistance uxcell 8mm x 301mm Hardened Rod Chrome... uxcell 8mm x 501mm Hardened Rod Chrome... uxcell 8mm x 601mm Hardened Rod Chrome... uxcell 6mm x 401mm Hardened Rod Chrome... uxcell 12mm x 500mm Hardened Rod Chrome... uxcell 6mm x 502mm Hardened Rod Chrome... uxcell 8mm x 380mm Hardened Rod Chrome... This linear motion shaft is chrome plated and case hardened. uxcell Linear Motion Rod Shaft Guide Set 2pcs 8mm x 200mm Linear Motion Guides Steel Plated Smooth with 2pcs SCS8UU Bearing Block & 4pcs Shaft Support for Automated Machines CNC Round steel shaft for use with linear support blocks and closed type slide units in linear motion applications