Air belt sander for use with 0.24 inch x 12.99 inch and 0.39 inch x 12.99 inch wide abrasive belts (4 belts included)Fully adjustable grinding arm with 360 degree rotation for easier use especially in confined spacesSuitable for grinding metal, plastic or wood. Measurement Uncertainty (Standard): 0.56 m/s squaredErgonomically designed trigger with safety throttle and speed control. Free Speed: 20,000 rpm. Handle design insulates against cold air and vibration. Vibration: 0.66 m/s squared. Sound Power Level: 96.5 dB. Sound Pressure Level: 85.5 dBSupplied with grinding arms for 0.24 inch and 0.39 inch wide 12.99 inch long belts.