So I grabbed a lot of strange step drill bits at the local used tool store, and am trying to figure out their original purpose. Google has been no help, so here is all I know: They seem to be of two groups, all appear the same, but the part numbers are of the form KCT-xxxx or CTA-xxx All are steel with, some are marked 'W&S', either monogram, or simple printing. Scans may make more sense than words
- KCT-90 w&s monogram, "u" (the quotes are on the drill) and the Cincinatti symbol
- KCT-1129 / 3740 W&S
- KCT-1129 / 3740 W&S
- CTA-1768 / 1/2(inverted)
thanks
-JSP