Up to 50 times more robust than a Bosch 2607001528 Extra Hard Bit. Do you need screwdriver bits that are suitable for demanding installation tasks? The bits are strong, durable, and easy to identify. Then the PRO Impact Bits are the right choice. They are made from modified steel to ensure strength. Both ends are equipped with screwdriver heads to double their lifespan. With laser markings, you can quickly select the bit you need. PRO Impact Bits are a great choice for installers who require strong and durable screwdriver bits for heavy applications. The bits are made from heat-treated, modified steel for excellent stability and resistance to high torque. Their torsion zone absorbs the torque stress at the tip of the bits, ensuring they do not break. The bits have heads on both ends, which increases their lifespan. They feature a color-coded ring that indicates the head type, as well as laser markings that help you select the required size. The set comes in a Pick and Click plastic holder, allowing you to keep your bits well organized. Impact-resistant 1/4-inch hex shank for use with impact drivers and drill drivers.