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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. They can be used on all stationary machines, drills, die grinders and side grinders.
6" Long x 1/4" Shank
Safety First - Always wear adequate & proper EYE, EAR, FACE, BODY and RESPIRATORY PROTECTION.