The Jacobs VDI 20 Hold-In-One tool holder has a 0-8 mm (0-5/16 In.) Capacity and is Prebalanced at 8,000 RPM. The Jacobs VDI 20 Hold-In-One's wide range of capacity increases productivity when rapid tool changes are required. The Bi Directional operation of the Jacobs VDI 20 Hold-In-One allows the chuck to be operated in both clockwise and counter clockwise rotation after firmly tightening. The Jacobs VDI 20 Hold-In-One tool holder is used for drilling, tapping and milling and is suitable for CNC machines and machining centers with automatic tool changers. The VDI 20 Hold-In-One chuck is one piece, molded and designed for superior durability. This one piece integrated design provides balance and ensures the chuck remains in place during operation. All Hold-In-One tool holders include a one year factory warranty