The SP Air 1/4" Heavy Duty 120-Degree Angle Die Grinder, No. SP-7212, has 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" and a hose size of 3/8". An ergonomically designed cushion-grip handle provides comfort. The unit offers a rear exhaust, a built-in power regulator and a safety throttle lever. The grinder, which is made in Japan, also has a direct drive motor with graduated trigger.