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.
These are used on side grinders and end grinders.
TAPER RH 5/8" X 11 INTERNAL THREADS 4 1/2" OVERALL LENGTH
Safety First - Always wear adequate & proper EYE, EAR, FACE, BODY and RESPIRATORY PROTECTION.