The Foredom H.20D 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. Includes a duplex spring for added flexibility. 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 handpiece can be replaced and/or adjusted if the hold on a bur shank is not secure. Measures 5 5/8" long, 1 1/8" diameter from the center, 3/8" diameter from the front taper, and weighs 4 oz.