Bosch Professional Keyless Chucks Can hold drill bits up to 16mm in diameter Compatible with 2-13x1/2-20 thread sizes Designed for use with Bosch Professional power tools Keyless design allows for quick and easy bit changes Durable construction ensures long-lasting performance Upgrade your Bosch Professional power tools with these keyless chucks. With the ability to hold drill bits up to 16mm in diameter and compatibility with 2-13x1/2-20 thread sizes, these chucks are a versatile addition to your toolkit. The keyless design allows for quick and easy bit changes, while the durable construction ensures long-lasting performance. Trust Bosch Professional for all your power tool needs.