[Good Hexagon Head Adapter] - Hexagonal drill adapter is made of quality material, with a hardness of 60 degrees, which is more impact- than chrome steel. The steel ball design on the top of the adapter prevents it from falling out of the wrench. 2 inch long, size: 3/16inch and 5/16inch. [HVAC Service Wrench Set] - Hvac service wrench set is an excellent tool for HVAC repair technology. Designed for maintenance and use, compatible with air-conditioning, refrigeration and other equipment. Refrigeration wrench, 4-in-1 Valve wrenches size include 1/4inch, 3/8inch, 3/16inch, 5/16inch, these sizes are the most commonly used sizes when repairing air conditioning and refrigeration equipment. Ratcheting Service Wrench has higher work efficiency and smoother maintenance actions. The ball valve can be opened and closed in just a quarter-turn rather than a stem-type valve. Curved design increase hand friction, prevent all kinds of overpowered valves. [Valve Core Remover Installer Tool] - The valve core remover tool can replace leaking valve cores quickly and easily. Remove and Install valve cores without loss of refrigerant. Suitable for home refrigeration equipments, dual size sae 1/4inch & 5/16inch port makes the valve core remover tool be compatible with R22, R12, R407, R410, R404, R32 A/C air condition system, etc. (Not suitable for Automotive AC). Suitable for the 1/4 inch socket of the HVAC service wrench. Refrigeration AC ratcheting ratchet wrench tool with hex bit adapter for HVAC tech, Gas Furnace, Air Conditioning, Refrigeration Equipment. Small and convenient, a great choice for work and home use., Manufacturer: CTRLZS