GIVIMO 2-Pack 39.4-in SBR12 Linear Guide Rail Set with 4 SBR12UU Slide Blocks and 0.47-in Shafts for CNC Router 3D Printer and Laser Engraver Builds

83.6 lbf Dynamic Load per Block: Each SBR12UU block is rated about 83.6 lbf dynamic and 123.4 lbf static, so four blocks share the load of a sled or gantry

Two 39.4-in Rails with 4 Slide Blocks: A complete SBR12 set covers one full axis with 39.4 in of rail length on 0.47 in diameter carbon steel shafts

Linear Bearing Blocks Glide Quietly: Built-in ball bearings let the aluminum blocks move with low friction and little noise, staying level on the round shaft

3D Printer CNC and Garage Workshop Builds: Fits router and mill sleds, laser engravers, 3D printers and trainer rocker plates in a garage, workshop or maker space

Chrome-Plated High Carbon Steel Shafts: Chrome plating resists wear and corrosion, and aluminum bases with holes at 1 in and 1.1 in spacing bolt down straight

Specification: Rail Model: SBR12; Rail Length: 39.4 in; Shaft Diameter: 0.47 in; Rail Size: 39.4 x 2.5 x 1.2 in; Slide Blocks: 4 x SBR12UU; Load per Block: 83.6 lbf Dynamic, 123.4 lbf Static; Material: High Carbon Steel, Aluminum; Net Weight: 7.5 lb