uxcell LM4UU Linear Ball Bearings 4mm Bore 8mm OD 12mm Length for CNC Machine 3D Printer 4pcs Size:4mm Spiral construction avoids shadow marks

Spiral construction avoids shadow marks and provides smooth cutting action

Christmas crafts and DIY

Jewelry making

Right size and it's very easy to use

uxcell LM4UU Linear Ball Bearings 4mm Bore 8mm OD 12mm Length for CNC Machine 3D Printer 4pcs Size:4mm Spiral construction avoids shadow marksuxcell LM4UU Linear Ball Bearings 4mm Bore 8mm OD 12mm Length for CNC Machine 3D Printer 4pcs Linear motion bearings provide freedom of movement in a single direction. Often used in conjunction with cylindrical shaft or rail. The steel ball is in point contact with the shaft and rotates with very little frictional resistance, so as to obtain smooth movement with high precision. Linear Ball Bearing Motion Slide Units Grease may be applied prior to use