BROWNELLS MAGNA-TIP® BITS | Brownells- gunsmith hex bit set ,As every gunsmith knows, such a flaw in a spring results in breakage! Standard, straight-tapered screwdrivers deliver all torque pressures to the fine edge of the screw slot. PLUS, being tapered, the laws of simple physics force the bit OUT of the slot.The complete sets include eleven bits for slotted screws, #1, #2 and #3 Phillips bits, plus ten hex bits for socket head screws.8900 Gunsmithing Set | Chapman MFG8900 is a 24 bit set with Phillips, Slotted, SAE Hex and 12 slotted bits. For gunsmiths, firearms, weapons, lanterns, sewing machines & fishing reels. Our slotted bits have straight parallel sides (not tapered like most screwdrivers) for maximum surface contact with the screws. Set includes a spinner. USA Made in CT.