3/4" Round/Hex Demolition Hammers 3/4" hex tool holder with variable-speed dial for controlled chipping applications. "Constant Response" circuitry provides soft-start, maintains constant speed under load, provides overload protection. Features: 3/4" Hex Tool Holder Bosch has been in the headlines of state of the art development for over 100 years. From the invention of the jigsaw to their ergonomic designed tools, Bosch as cared about the customer since they started business in 1886.