The SP-7211 by SP Air Corporation is a 1/4″ heavy-duty angle head die grinder. An ergonomically designed cushion-grip handle provides greater comfort during use. Th eunit offers a rear exhaust, a built-in power regulator and a safety throttle lever. Unit specifications include a free speed of 18,000 rpm, a required air pressure of 90 psi, average air consumption of 3.3 cfm, an air inlet size of 1/4″,