The Zona Revolving Tool Holder with 2 Collets features a ball-shaped pin vise head fits the hand, while thumb and index finger twist the chuck. This revolving tool holder is ideal for drilling larger holes in soft stock. Includes two collets with capacity of .015′p .050′ & .062′p .113′ ( .381p 1.27 mm & 1.574 p 2.87 mm) diameter. For drills, taps and reamers. 3-7/8′ overall length.