4pcs LM25UU 25mm Linear Ball Bearing Bush Bushing 25*40*59mm for DIA. 25mm linear shaft rod DIY CNC Linear bearing ball cage, hardened coat of both ends ring. Bearing various parts of the size is standardized, interchangeable, no worry if replacement of worn Ball in the cage loop to run a smooth ball guide surface to ensure. Size : 25*40*59mm Color : silver