These are all
bitstocks for use in a brace, and have a square ended shank.
If anyone has other bitstocks that they can add to this list, or better
pictures than I have here, please submit them for addition to the
Spur = protruding cutting edge that scores the outer dimension of the
Lip = cutting edge that removes the waste at the bottom of the hole.
Leftmost: Bridgeport Gun Implement Co (marked B.G.I. Co) has no centre
point and only one cutting lip.
Middle bit has no centre point and two cutting lips.
Rightmost has a centre point and two cutting lips.
This die stock takes standard (modern) 1 inch dies.
Left and middle: Rose head countersinks.
Right: "snail" countersink
Left: Roberston #1
Centre & Right: flat bits marked 8 and 10 respectively.