Multifunctional HVAC Service Wrench Set --- The hvac service wrench set are made of premium stainless steel, 4 in 1 Valve wrenches size include 1/4", 3/8", 3/16", 5/16", these sizes are the most commonly used sizes when repairing air conditioning and refrigeration equipment. Hexagon Head Adapter --- Premium alloy steel and surface heat treatment, 2 inch long, size: 3/16'' and 5/16''. Suitable for the 1/4 inch socket of the HVAC service wrench. The hexagonal head adapter has a bead structure to prevent it from falling off the handle due to gravity when it is pointed downward. Wide Application Core Remover Installer Tool --- The Valve Core Remover Installer Tool with Dual Size SAE 1/4 & 5/16 Port, made of pure copper, the ball valve can be opened and closed in just a quarter-turn. Curved design increase hand friction, prevent all kinds of overpowered valves. It compatible with R22, R12, R407, R410, R404, R32 A/C air condition system, etc. (Not suitable for Automotive AC) Upgraded Valve Cores --- The bottom of the valve cores are made of durable stainless steel material, strong resistance to fluorine and heat, has longer service life than ordinary valve cores. We recommend you use a dab of vacuum grease on the end of the probe to insure that the schrader valve stays attached to it during core removal. What You Get --- 1PC Valve Core Remover Installer Tool, 1PC Dual Size SAE 1/4 & 5/16 Port, 1PC 3/8” to 1/4” HVAC Service Wrench, 1PC 5/16'' x 1/4'' Refrigeration Service Wrench, 2PCS Hex Bit Adapters, 10 PCS Valve Cores. If you have any questions, 24/7 support when you need it.