This spindle allows you to mount a polishing mop to an Angle Grinder. Suitable for 4-1/2" (115mm) and 9" (230mm) Angle Grinders. M14 Threaded. Suitable for all polishing mops that require a taperd arbor to mount. The tapered thread cuts it's own thread into the polishing mop. 102mm total length. For best results it is recomended to use a smaller diameter polishing mop than you would a grinding wheel. Polishing mops create a lot more friction than grinding wheels because they are wider and flatten/spread more agains the work.