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