Extend the reach of any 1/4-inch hex shank driver an extra 3, 6, 10 or 12inch increment with a Quick-Change Malco Extension Bit. All bit extensions have a fast and easy push-in style receiver, with 3 ball bearing detents that holds any 1/4-inch hex shank power groove or insert bit securely. The impact grade steel construction make these a reliable and durable tool to use on the jobsite.