Features the Quik-Lok All-Hex Extension the most versatile extension available. Offers extended reach and is the only extension which will hold insert bits, power groove bits and double-ended bits Quik-Lok All-Hex Chuck provides fast and easy accessory changes and fits all 3/8- and 1/2-inch drill chucks. Titanium drill bits for long life and superior performance Screwdriver bits made from premium quality S2 steel for high torque applications Lifetime guarantee, Manufacturer: Milwaukee