Proto DuraTek Series screwdriver sets are used for installing and removing screws in metalwork, woodwork and carpentry applications. They are provided in sets of 4, 6 and 9 units. Featuring quad-lobe handle design with 360-degree texture for secure grip, these screwdriver sets are designed to meet even the most demanding heavy-duty needs of maintenance and assembly applications. Their handles are impact & chemical resistant that can be used with most harsh chemicals, including hydraulic fluids of the aerospace industry. The steel shanks are heat-treated through their entire length for strength against twisting and bending of screwdrivers when placed under torque. They feature tips that are plated with a black oxide finish to effectively prevent chrome peeling. Proto screwdriver sets meet or exceed ASME B107.15 standards.