The Foredom Hand-piece H.8 is a slim collet type hand-piece with pre-lubricated ball bearings that require no additional lubrication. It has a chuck guard that slides back when changing burs. Comes with 3/32″ and 1/8″ collets and chuck wrenches for changing collets and accessories. Measurement: 6-1/8″ long, 5/8″ dia.