VEVOR SBR20 1200mm Linear Guide Set, Comes with Two 47.2-inch SBR20 Rails and Four SBR20UU Bearings, Perfect for Crafting CNC Routers and Automation Equipment Handle Pressure with Ease Smooth Sliding without Stutter More Accurate Than Ever Broad Usage Scenarios Strong Corrosion Resistance Installation Made Easy Shaft Diameter: Φ20 mm,Material: High Carbon Steel & Aluminum,Model Number: SBR20-C 1200L,Product Dimensions(L x W x H): 47.2 x 3.5 x 1.4 in/1200 x 90 x 36.3 mm,Package Size(L x W x H): 51.6 x 5.7 x 3.1 in/1310 x 145 x 80 mm,Dynamic Load (per block): 882 N,Mounting Hole Distance B: 1.4 in/35 mm,Mounting Hole Distance A: 1.4 in/35 mm,Slide Block Size(L x W x H): 2 x 1.9 x 1.5 in/50 x 48 x 39 mm,Static Load (per block): 1370 N,Slide Block Model: SBR20UU,Net Weight: 20.3 lbs/9.2 kg,Guide Rail Length: 47.2 in/1200 mm