Norton BlueFire 66252843247 DC914CH Type 27 All Purpose Depressed Center Cut-Off Wheel With Quick-Change Hub, 9 in Dia x 1/4 in THK, 7/8 in Center Hole, 24 Grit, Aluminum Oxide/Zirconia Alumina Abrasive

Norton BlueFire Cut-Off Wheel, Type 27 All Purpose Depressed Center, Series: DC914CH, 9 in Wheel Diameter, 1/4 in Wheel Thickness, 7/8 in Center Hole, Arbor Connector, 24 Grit, Extra Coarse Grade, Aluminum Oxide/Zirconia Alumina Abrasive, Wheel Type Number: Type 27, 6600 rpm Maximum, Applicable Materials: Ferrous Metals, Gray Iron and Stainless Steel, Wheel Hardness: S, Black Wheel, Yes Reinforced, Specifications Met: ANSI Specified

Depressed center wheels may also be referred to as raised hub wheels or by their shape designation Type 27, 28 or 29, with Type 27 being the most popular. The depressed center design allows the flange/lock nut to recess within the wheel so that it can be used for various grinding and cutting applications. Depressed center wheels are designed to handle the most severe right angle grinding applications from heavy stock removal to rough blending. More recently, depressed center wheels have been designed for cut-off applications when the tool is proper designed with flanges and guards. While large right angle grinders (7 in and 9 in) have been around for many years, small or mini grinders that handle 4 in, 4-1/2 in and 5 in wheels have made this machine and wheel category, the most popular in power tools.