US standard GGG-W-651, Type I, Class B. Stillson pipe wrench (361 series). This installer wrench or pipe wrench is designed for use with round pipes and fittings. It is ideal for various fields and professions, including plumbers, heating, ventilation, and air conditioning technicians, maintenance workers, and DIY enthusiasts.

Features and benefits include a traditional one-handed self-locking Stillson wrench, a spring-loaded mechanism similar to a ratchet mechanism, and a construction made of chrome-vanadium and traditionally forged steel. The corrosion-protected induction-hardened spring rods in the housing provide additional durability.