Foredom General Use Hand Piece 8 The #8 has a slim design and a chuck guard sleeve that protects the fingers when working close, and slides back when changing collets and accessories. Comes with 3/32" & 1/8" collets and set of chuck wrenches. Dimensions: length 6 1⁄8" x 5⁄8" diameter. Available as the basic hand piece or with the added duplex joint. The duplex joint or duplex spring provides extra flexibility to a hand piece when more precise control for delicate work is required. Duplex joint hand pieces are not covered under warranty.