VEVOR Linear Rail, 2PCS SBR12-1000mm, Linear Guide 2 PCS Linear Guide Rails, 4 PCS Square Type Carriage Bearing Blocks, CNC Rail Linear Rails and Bearings Kit, for Automated Machines and Equipments Fine Workmanship Heavy-Duty Material Complete Linear Guiding System Simple Installation Quiet Operation Extensive Application Rail Shafts: SBR12, 39 in / 1000 mm,Gross Weight: 11.0 lbs / 5 kg,Package Dimensions: 44 x 4 x 4 in / 110 x 10 x 10 cm