SAIT Type 27 depressed center cut off wheels are fast cutting and extremely long lasting for tough applications
Amazon.com: United Abrasives-SAIT 23324 Type 1 4-1/2-Inch x .045-Inch x 7/8-Inch 13300 Max RPM Z-Tech - High Performance Cut-Off Wheels, 50-Pack : Everything Else
United Abrasives/Sait Abrsv Cut-Off Wheel,T27,4-1/2in,5/8in-11 23319 - Walmart.com
United Abrasives .045 Type 27 Aluminum Cut-Off Wheel | 22370 | 7 Dia.
United Abrasives SAIT® 22380 - 4-1/2" x .045" x 7/8", The Ult - Diamond Tool