DEWALT® DW831 heavy-duty 5 In. (125 mm) medium angle grinder features a 12.0 Amp AC/DC motor producing 10,000 RPM of high speed for fast material removal. Applications include grinding metal with 1/8 In. or 1/4 In. subbed or depressed-center wheels; cutting metal with type 1 and type 27 thin cut-off wheels; finishing metal with wire cup brushes, wire stringer bead wheels, sanding flap discs, or sandpaper; cutting aggregate with diamond wheels; finishing aggregate with diamond cup wheels.