Excellent general purpose handpiece. Similar to the # 30 handpieces but with collets instead of Jacobs chuck.. Collet-type chuck handpiece accommodates accessories with shank sizes up to ‚1/4" in diameter. Comes with three collets: 3/32" (2.35mm),1/8" (3.18mm) and ‚1/4" (6.4mm), and pin and chuck wrench. Other fractional and metric collets are available separately and in Collet Set 440. Can also be used in Foredomalt#39;s handpiece holder and drill presses. 53/8" long,1" diameter (center) 31/2" diameter (taper), wt. 5.85 oz., ship wt. 7.5 oz.