The Foredom® #20 Quick Change Handpiece is for exclusive use with 3/32" (2.35mm) shank burs. A lever action on the the handpiece body is all that is required to change accessories. It has a molded plastic front grip with tapered sides for easy and close handling, plus pre-lubricated ball bearings that do not require additional lubrication. The collet in this hand piece can be replaced and/or adjusted if the hold on a bur shank is not secure. 5 5/8" long. 1-1/8" diameter (center), 3/8" diameter (front taper). Instructions. Parts list.