North Bros. Mfg. Co. catalog:
The finest bit brace ever made.
Holds any shape bit ( round, square, any taper) in a vise-like grip.
Ratchet works without calling for a hand to hold chuck from turning
back. Does every kind of boring job within scope of a bit
Quick-centering, Ball-bearing Chuck.
Holds round shanks up to 1/2 inch diameter and square shank up to
5/8 inch across corners used on larger bits. Ball-bearing give
easy action in your hand, enabling you to lock and release bits at a
turn of a wrist.