B3555 Use for grinding, polishing, buffing and deburring. The extra length allows you to reach more confined areas. Reversible hardened steel 1/4" collet. Planetary gears for longer life and smoother running. Low profile teasing throttle for precise speed control. Rotating air inlet to prevent the air hose tangling. Specifications: Model number: B3555 Collet size: 1/4" (6mm), 1/8" (3mm). Free speed: 25,000rpm. Recommended air pressure: 6.2Bar (90PSI). Air consumption: 4CFM* (113ltr/min). Air inlet thread: 1/4" NPT. Minimum air hose size (ID): 10mm (3/8"). Noise level: 91dBA. Sound power level: 98dBA. Vibration level#: 4.53m/s2. Overall length: 260mm. Net weight: 0.68kg. ?Per Pneurop Standard Per EN 12366. #Per EN 28927-1. *Based on a 15 second cycle per minute average use.