Part No. 66252843247 IDG No. 66252843247 DxTxH 9"x 1/4"x 7/8" Maximum RPM 6,600 Type Steel/Stainless - Grinding BlueFire Depressed Center Wheels: This blended aluminum oxide and zirconia alumina product is the best choice for the customer who wants a superior product at a value price. BlueFire wheels offer versatile performance on stainless steel and a wide variety of metals. ò 20% improvement in cut rate over the original BlueFire wheel ò 2 times the life of aluminum oxide wheels ò Free cutting ò Effectively grinds a variety of metal from alloys and stainless to gray iron ò Long life and economical prior performance ratio lowers total grinding cost