BestEquip Linear Guide Rail 2Pcs HGR20-1500mm Linear Slide Rail with 1Pcs RM1605-1500mm Ballscrew with BF12BK12 Kit Linear Slide Rail Guide Rail Square for DIY CNC Routers Lathes Mills

This linear guide rail kit comes with rails, guide blocks, bearings for lead screw and lead screw itself, and pillows. Some customers had issues with the ball screws, particularly with the runout and bends along the axis. The machining tolerances were also not consistent, with different blocks riding on the rails with different resistances. However, other customers have reported that the rails slide well and the bearings are tight. Packaging appears to be an issue with some customers receiving opened boxes and no padding. On the other hand, the package includes all necessary components, which is helpful for those building a CNC machine.