[Kit contents] The kit contains: 1 air ratchet (for 5/16 and 1/4) + 1 air ratchet (for 3/16, 5/16, 1/4 3/8) + 2X Hex Bit Adapter (Air Conditioning Tools and Equipment Accessories). [HVAC Ratchet Wrench] Air conditioning tools are made of alloy steel, which is sturdy and durable; the ratchet structure can use this wrench to turn them easily in a small space to avoid falling into narrow places, such as the chasm behind the walking cooler. [Hexagonal head adapter] S2 alloy steel and surface heat treatment, can be used with the HVAC service wrench 1/4 socket, suitable for a variety of sizes. The hex head adapter has a beaded structure to prevent it from falling off the handle due to gravity when pointed downward. [Easy to use] 1/4, 3/8, 3 valve wrenches /16, 5/16, Hex Head Adapter: 2 inches long, Size: 3 /16 and 5/16 These sizes are the most common sizes used when repairing air conditioning equipment and refrigeration tools.[Wide scope of application] Air conditioning tools are specially designed for maintenance and use. They are compatible with air conditioning, refrigeration and other equipment. It is convenient for you to open and close the compressor maintenance valve, rotary lock valve and stop valve. HVAC tools are suitable for daily work and home maintenance.