Up to 13-mm Diameters - The Keyless Chuck is a Bosch System Chuck with a capacity from 1.5- to 13-mm diameters. It clamps drills using minimal effort without requiring a key. The Keyless Chuck is compatible with Bosch impact drills. The Keyless Chuck is compatible with Bosch impact drills. Features and Benefits: • Up to 13-mm Diameters • Keyless Chuck is a Bosch System Chuck with a capacity from 1.5- to 13-mm diameters • Clamps drills using minimal effort and does not require a key Specifications: Chuck capacity: 1.5–13.0mm Mount, range: 1/2" – 20 Drill chuck, type: Bosch system chucks