The Foredom H.10D is a slender handpiece with rotating lever action that releases and closes the collet for quick and easy changes. Includes a duplex spring for added flexibility. It requires lubrication after the first 2-3 months of continuous use. For use ONLY with 2.35mm (3/32") burs. Handpiece measures 7 3/8" long, 21/32" diameter, and weighs 4.55 oz.