1/2 in. Keyless ratcheting for simple bit changes. Has a metal sleeve for rugged sturdiness. Use simplest in rotation mode.
From the Manufacturer
Bosch Keyless Chuck Adaptor.
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EFFICIENT: The Bosch HA3JAW Keyless Chuck is efficient and convenient by briefly locking bits into place.
COMPATIBILTY: The 3-jaw chuck is built to be used with SDS-plus hammers and straight shank drill bits
DURABLE: The HA3JAW is built with a steel metal sleeve for max rugged sturdiness.
QUALITY: Bosch makes the very best quality rotary hammer accessories