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Function This shaft extension is designed to polish 1/2 or 5/8 electric motor into 1/2 threaded shafts or transfer 5/8 grinding shaft to 1/2. Application: This electric motor threaded shaft adapter is suitable for mounting polishing discs, polishing discs, grinding discs, wire brush wheels, as long as the hole is 1/2 inch. Application: attach the pipe side to your motor mandrel or grinder, attach the hidden one to make it quickly. Use the 2 washers, sandwiches to fix the polishing wheels, etc., then tighten the nut and start polishing work. Advantage: Make your motor like a transformer, save yours, only a small motor mandrel shaft extension adapter can create a new grinder or polishing machine, really worth your back. DIMENSIONS - Pipe side OD x ID x L: 7/8 x 0.6 x 1.5; inner diameter of hose: 1/2; side diameter x L: 1/2 x 1-3/4; hex nut diameter: 5/6; washer diameter x thickness: 1 -1/20 3 x 1/16 material: steel