The Foredom H.18D Handpiece is for use with only 2.35mm (3/32") shank burs. A press lever action is all that is required to change accessories. Includes a duplex spring for added flexibility. It features a very slim grip and pre-lubricated ball bearings that do not require any lubrication. Measures 7" long, 19/32" diameter, and weighs 3.65 oz.