1.5- to 13-mm Diameters - The Keyless Chuck with Adapter is a Bosch System Chuck that easily mounts and dismounts without tools. It clamps drills with 1.5- to 13-mm diameters using minimal effort and does not require a key. The adapter is compatible with Bosch Rotary Hammers. Features and Benefits: • 1.5- to 13-mm Diameters • Keyless Chuck with Adapter is a Bosch System Chuck that easily mounts and dismounts without tools • Clamps drills (1.5- to 13-mm diameters) using minimal effort and does not require key Specifications: Chuck capacity: 1.5–13.0mm Mount, range: SDS Drill chuck, type: Keyless chuck