VEVOR Linear Motion Guide Kit, SBR20 1800mm, Includes 2 PCS 70.9 in/1800 mm SBR20 Rails and 4 PCS SBR20UU Bearing Blocks, Ideal for CNC Machines, Automation Equipment, and DIY Projects 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 1800L,Product Dimensions(L x W x H): 70.9 x 3.5 x 1.4 in/1800 x 90 x 36.3 mm,Package Size(L x W x H): 76 x 5.7 x 3.1 in/1930 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: 29.5 lbs/13.4 kg,Guide Rail Length: 70.9 in/1800 mm