Archived from the Tools In Action forum (Hand Tools). This thread is read-only.
Welcome to the forum.
Those look like combination wood spade drills, for flat head screws, to bore below the surface, that would then be filled w/ a wood plug for a hidden fastener.
Interesting and makes sense. Never seen that before.
There is a British brand called Trend and they have a range that they call it Trend Snappy which has the Snappy drill bits and other hex shank accessories from US plus other accessories from other brands such as G&J Hall (British). G&J Hall produces step drill bits and taps for them, here are the photos. This is the only brand I have seen that does make hex shank taps and only taps (not drill and tap), sizes are metric M3.5, M4, M5, M6, M8 and M10. and they make to step drill bits for them which each of them has three steps for three taps, one is for M3.5 – M5 – M8 and the other one is for M4 – M6 – M10 taps. These photos remind me Snappy step drill bits.
it is kind of key.