300 - Stillson Pipe Wrench BS 3594 Part I •Load bearing components – Handle – Hook Jaw - drop forged from special steel with dual heat treatment, which ensures unlimited wear resistance of the teeth. •Knurled adjusting nut forged from special steel – hardened & tempered. •Frame made from non-breakable S.G. Ductile Iron. •Accurately machined Screw threads & nut. •New system of dual coil spring, which ensure immediate grip of the pipe and perfect ratchet action. •Teeth hardened to 55 Hrc.