Designed for wet environments with grip teeth and ergonomic non-slip handles, ideal for rusty valves in basements, commercial kitchens, or outdoor plumbing systems Professional valve core removal installer with 1/4 & 5/16 ports features chrome steel construction, high torque resistance to stubborn copper. Removing valve core for plumbing / HVAC maintenance Ideal for HVAC technicians, real estate maintenance and enthusiasts who need excellent tools for air conditioning repair and bathroom fixtures replacement Multifunctional 4 in 1 wrench set includes 1/4", 3/8", 3/16" and 5/16" adapters, compatible with 95% of major brands of fittings A complete HVAC service wrench set includes 10 steel valve cores and hex bit adapters to achieve a huge success rate by installing an old faucet, Manufacturer: Pffiocix