The Foredom H.15D Handpiece has hammering rather than rotary action for use at low speed (0-5,000 rpm) by jewelers for stone setting and decorative work. Comes with an anvil point (HP10177). Includes a duplex spring for added flexibility. Handpiece requires periodic lubrication. Hammer has 1/32" stroke and its impact can be adjusted from light to heavy by turning the silver knurled adjusting ring. Handpiece measures 6 1/4" long, 1/4" diameter at tip, and weighs 3.65 oz.