Taylor Pneumatic: Pencil Grinder - RPM: 54,000. Collet: 1/8". Wt: 3-3/4 lbs. Pencil Grinder - RPM: 54,000. Collet: 1/8". Wt: 3-3/4 lbs. RPM: 54,000. Collet: 1/8". Blows per minute: 1200. Length: 5-1/2". Weight: 3-3/4 lbs. Exhaust: rear. Precision ball bearings. Rear exhaust. Twist throttle. The perfect tool for cleaning and polishing dies, porting and polishing engines, de-burring casting