Rothenberger 70592 Machine Groove Pliers, 12"Special chrome-plated vanadium steel,drop forged, tempered, polished head, with sliding joint, even jaws. Complies with DIN 5231 ERothenberger 70592 Machine Groove Pliers, 12" Features:; Relief-milled grooves: Completely relieves stress on joint screw; Absolutely firm fit in every open position...