Tapered Spindle Adapter Threaded for Bench Grinder Buffing Polishing Wheel with Left and RightSpindle adapter right and left hand for bench grinderPlease noted: This bench grinder spindle adapter is used on bench grinder with 8mm arbor shaftUsed to converting your bench grinder into a bench polisher using this bench grinder spindles,and they are held in place by grub screwsUsing guide: Firstly romove the outer guard, grinding stone and inner guard on your bench grinder step by step, then fix the spindle adapter to the shaft of the bench grinder, and fix tight with the grub screw, now you have a bench polisherYou can get 2 pieces ( right hand and left hand )