Weiler Drive Arbor, Threaded Shaft, 3/8 in. Arbor Hole, 3/4 in. Shaft Length, For Use With a 3 in. Dia. Brush, 25000 rpm Maximum Drive arbours are for use with small-diameter wheel brushes only; do not attempt to use them with cutting or grinding wheels, buffing wheels, or any type of abrasive wheel or disc. Never mount a drive arbour onto a tool that operates above the maximum RPM rating of either the arbour or the brush (whichever may be lower), and be sure that the stem of the arbour is properly secured in the collet or chuck before use. At Weiler, we passionately embrace change to improve our products and processes and move the company and our customers forward.