HEAVY-DUTY PIPE WRENCH

 Handle:
　　　　 Shell Mold Casting. Ductile.
 Upper Jaw:
　　　　 Carbon Steel (S45C), Drop Forged,
　　　　 Quenching & Tempering HRC 45-48 degree.
 Lower Jaw:
　　　　 Carbon Steel (S45C) Drop Forged.
　　　　 Quenching & Tempering HRC 45-48 degree.
 Flating Spring:
　　　　 Carbon Tool Steel (AISI W1),
　　　　 Quenching & Tempering HRC 30-40 degree.