Every gunsmith knows no two screw slots are ever exactly the same. Because so many factories use outside vendors for screws, slot sizes can vary, even within the same model of gun. If you want to be professional about your work, you custom grind each bit to the correct size, a frustrating and time-consuming task without a Super Set.
Magna-Tip Bits feature TRUE hollow-ground bits which transmit all the energy of torque evenly and smoothly, up the shank of the bit. Not only does hollow grinding permit this power transfer, it also gives complete metal-to-metal contact between the tip of the bit and the entire screw slot. Thus, maximum power can be exerted.
The 58 Bit Master Super Set Plus adds 10 hex-head bits (#185-9, #185-10, #185-00, #185-0, #185-1, #185-2, #185-3, #185-4, #185-5, #185-6), 3 Phillips-head bits (#440-1, #440-2, #440-0), and a 1/8"" square bit for Remington buttplates to the contents of the 44 Bit Super Set Plus. It's the most incredible screwdriver system you will ever use!
Big Book Catalog, Issue:73, Page:444