VEVOR Linear Rail Guide Kit, HGR20, 2Pcs 1000 mm (39.4 inch) Linear Motion Rails and 4Pcs Bearing Slide Blocks, Anti Rust and High Precision Kit, for DIY, CNC Routers, Lathes, Mills, 3D Printers Complete Linear Guide Rail Kit Corrosion-Resistant Finish High Precision Heavy-Duty Load Capacity Widely Compatible Low-Noise Sliding Rail Length: 39.4 in/1000 mm,Static Motion Load Capacity: 27.76 kN/180 kg,Slide Block Type: HGH20CA,Straightness: 0.05 mm/1000 mm,Item Model Number: HGH20CA-1000L,Dynamic Motion Load Capacity: 17.75 kN/116 kg,Quantity: 2 pcs,Surface Finish: 0.1–0.22 μm,Material: Medium Carbon Steel & Aluminum,Diameter: Ø 0.98 in/25 mm