Chicago Pneumatic CP3019-12AC - 1/4 Inch (6 mm) Air Angle Die Grinder, 0.5 HP / 370 W - 12000 RPM 6151604070High performance in a compact package High performance in a compact industrial Air angle die grinder tool with a powerful 0. 5 hp (375 W) motor. The CP3019 Series angle pneumatic Die Grinders, with a 1 4" (6. 35 mm) collet capacity or CNOMO collet capacity consists of 4 models with 2 free speed options from 12,000 to 20,000 rpm. The powerful motor offers 0. 5 hp (375 W) for optimum productivity in heavy applications such as deburring, die contouring,