4pcs LM5UU 5mm Linear Ball Bearing Bush Bushing 5*10*15mm for DIA. 5mm 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 : 5*10*15mm Color : silver