Though we don’t use them in our shop as much as our other type of clamps there are times when nothing else will do. Handscrews are particularly good for clamping uneven surfaces or when you need a deep reach. They can be used as a vise and great for holding items down on a drill press. These are just a few of their many special uses, besides just being great clamps.
These ones were made by the Brink & Cotton Mfg. Co. From Bridgeport, CT, USA. We picked them up at a yardsale several years ago and they have held regular use in our shop since then.