Function: 1. The seal is added between the slider and the synchronous wheel, insulating 1mm to lock firmly. 2. Smooth rotation, no mutual grinding, good accuracy. 3. This unpowered spindle is precisely machined by the grinder with an accuracy of do 0,005 mm. 4. Can be used do DIY table drills, table mills, table saws. e.t.c. 5. It can work with 4-inch grinding wheel, do cutting saw blade, etc. Specification: Characteristics: The seal is added between the slider and the synchronous wheel, isolating 1 mm to lock firmly. Smooth rotation, no mutual grinding, good accuracy. This unpowered spindle is precisely machined by the grinder with an accuracy of do 0,005 mm. Can be used do DIY table drills, table milling machines, table saws. e.t.c. It can work with 4-inch grinding wheel, do cutting saw blade, etc. Material: stal List of packages: 1 x connecting rod 1 x XL20 tooth synchronization wheel 1 x zipper 1 x gasket 2 x bearing 2 x hex key 1 x B16 drill chuck set 2 x screw sleeve 2 x large key 1 x M10 shaft sleeve Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.