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Has your driver bit ever destroyed the wood surface around a countersunk #4 or #6 screw? Standard Power Driver bits are sometimes too large to fit into a 1/4" diameter countersunk hole to drive a recessed screw. When that happens, the driver bit body makes a mess of the wood surrounding the hole. Normally, this is only a problem when using a 1/4" diameter countersink with #4 and #6 screws. The solution is quite simple - use a driver bit with a reduced shank. That way the bit tip can reach the screw without creating an unsightly mess. One-piece bits are usually a disappointing compromise between the need for a hardened tip and a durable body. A special Iso-Temp heat treating process makes these the toughest one piece bits available though, and their reduced shank nose can reach just a little farther into a countersunk screw hole without damaging the wood.
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positve grip,non-marring
By dan,the tool man
from fond du lac,wi
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Comments about #1 x 1-15/16'' Reduced Shank Square Drive Bit Ball Detent:
works great,non-marring and lets you countersink properly