Part No. 66252843185 IDG No. 66252843185 DxTxH 7"x 1/4"x 5/8"-11 Maximum RPM 8,600 Type Stainless Steel - Cutting/ Pipe Notching/ Light 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