11-30-2014, 03:39 PM
Arbalest, I don't think the ones you pictured are the same as the Starrett ones. The ones you show are 3 piece. The knurled/threaded collar , the body (slit in four pieces up to close to the handle) and the sliding handle. The Starrett ones I own and prefer have 2 separate jaws connected by a spring to cause them to open when the knurled collar is unscrewed.
SteveC
SteveC
Busy Bee 12-36 lathe, Busy Bee Mill drill, Busy Bee 4x6 bandsaw, Homemade 9x17 bandsaw, Ad infinitum.