Irwin 4" Mini Locking Vise Grips are the smallest of the vise grip pliers. Very handy for precision work. Cover the serrated jaws in leather or with a thermoplastic like ThermoLoc or Jett Sett to protect your work.
Pliers are 118mm (4-1/2") Long. Jaws are 15mm (5/8") deep by 8mm (3/8") at there widest point tapering down to 4mm (1/4").