RotoZip RZ10-2300 120-Volt Spiral Saw Kit Quick-release foot can be adjusted for cuts up to 1 ft. deep 5.5 Amp. Variable Speed (15,000 - 30,000 RPM) provides precise control of cutting speed when cutting a variety of materials Soft-grip body for all day comfort 3-Jaw Chuck eliminates use of collets and allows for quick, easy and wrenchless bit changes Collet System Includes 1/8", 5/32" and 1/4" collet and collet nut, also for use with Zip Bits and new XBITS