Size: 1/2" & 5/8" Motor Shaft Arbor Extension Adaptor Package includes: 2 set 1/2" & 5/8" Motor Shaft Arbor Adaptor: ------Main body 2pc, inner adjust tube 2pc, tighten screw 2pc, washer 4pcs, hex nut 2pc, L-shape hex wrench 2pcDetail size: Tube side OD x ID x L?7/8" x 5/8" x 2-5/8"; Inner adjust tube ID?1/2"; Screw side dia x L?1/2" x 2-1/4"; Hex nut dia x thickness?13/16" x 3/8"; Washer dia x thickness: 2-1/8" x 1/16"; L-shape hex wrench: long part 2-1/4", short part 7/8".Q & A: ?What?s the function of this shaft arbor adaptor designed for? ?This Shaft Arbor Extender is designed to convert 1/2" or 5/8" shaft electric motor to 1/2" threaded shaft buffing machine, or transfer 1/2" or 5/8" Bench Grinder shaft to 1/2" thread shaft. ?What kind of wheels it is suitable for mounting? ?This Electric Motor Arbor Threaded Shaft Adapter suitable for mounting Buffing wheels, Polishing wheels, Grinding Wheels, Wire brush wheels, as long as the arbor hole is 1/2". ?How to use? ?Attach the tube side to your motor arbor or bench grinder shaft, fasten the hidden screw to make it fastness, use the 2pcs washers sandwich cinch the buffing/grinding wheels etc, then tighten the nut and start buffing work. ?Why you need buy one? ?Save your money, just a small Motor arbor shaft extension adapter can create a new grinder or buffing machine, make your Motor like a transformer, really worth your money back. ?If you like it and also be just what you want, add it to your cart then take it back home!Any question pls don?t hesitate to contact us through message center :)Click following link get access into our Amazon shop: www.amazon.com/shops/EMILYPRO