Designed to be used with pinhole center wheels. No need for washers or nuts! Spiral thread allows wheel to spin up tapered shaft when motor is turned on. Designed to be used specifically with the 1 HP and 1 1/2 HP Baldor Buffers.
TAPER LH 7/8" X 9 INTERNAL THREADS
Safety First - Always wear adequate & proper EYE, EAR, FACE, BODY and RESPIRATORY PROTECTION.