Maximum jaw opening size matches ASME specifications Knurled adjusting screw turns easily by hand or with a hex key inserted into the hex key receiver on bottom of screw Compound action for powerful non-slip locking grip After initial grip is set, pliers can be tightened further by turning the adjusting screw with a hex key Plastisol dip on release lever for improved comfort Versatile curved jaw also features integral wire cutter Angled tooth pattern for a better grip Nickel-plated finish resists rust and corrosion