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The Brownells MAGNA-TIP screwdriver allows for a precise fit on almost all gun screws and household screws. The bits are designed with a TRUE hollow-ground shape that ensures even energy transfer up the shank of the bit. This design allows for maximum power to be exerted. Other screwdriver designs, like the "hollow-ground" type, concentrate torque at the square edge, which can lead to breakage. Standard screwdrivers can also deliver all torque pressures to the screw slot's fine edge and can be forced out if they are tapered. The MAGNA-TIP screwdriver sets include eleven bits for slotted screws, #1, #2 and #3 Phillips bits as well as ten hex bits for socket head screws. You can customize your set further by grinding extra bits with the special Shaping Stone shown on this page for an even better fit. The screwdriver bits are made with materials that are durable and strong, ideal for industrial production settings.