Product Description The BOSCH line of countersinks are great for deburring and chamfering openings to pre-drilled holes. Great for electrical, plumbing and HVAC contractors. BOSCH countersinks cut varied materials cleanly and accurately. With standard high-speed steel and super hard titanium-coated bits, these countersinks perform great in even the toughest materials. From the Manufacturer Bosch Keyless Chuck Adaptor. VERSATILE: The Bosch HA3JAW keyless chuck delivers rotation drilling for masonry, brick, and block UNIVERSAL FIT: The three-jaw chuck is built for use with all Bosch and competitive brands SDS-plus hammers EFFICIENT: Keyless ratcheting quickly locks straight shank drill bits into place. DURABLE: The HA3JAW is built with a steel metal sleeve for maximum rugged durability. FOR USE: Use only in drill-only mode on all SDS-plus rotary hammers B0062ICGEM