Holds work in any imaginable position, rotating thru 360deg, tilting 180deg. NO. 303 Head has heavy-duty adjusting screw, brass bushing, double steel guide pins. Mfg: Pana Vise SPECS: Nylon jaws are 2A 1/2'''' (6.35cm) wide, open to 2A 1/4'''' (5.39cm) with throat of 15/16'''' (2.42mm).