Double ended reversible ratchet wrench are clearly marked, which are widely used in daily work and home maintenance. Standard HVAC tool adopts a flat integrated design, 4 in one multifunctional size, and the material is from 45# steel, which belongs to medium carbon steel, with a carbon content of about 0.45%. The carbon content is optimized to improve the mechanical properties of the steel, so that it has a higher strength. Hexagon bit adapter is made of S2 material, which has more advantages than chrome steel, impact resistance, strong torsion, high hardness, hardness up to 60 degrees. Service wrench is an excellent tool for HVAC repair technology. Designed for maintenance and use, compatible with air-conditioning, refrigeration and other equipment. The ratchet structure can use this wrench to easily turn them in a small space to avoid falling into narrow places, such as the abyss behind the walking cooler. Compared with ordinary wrenches, Ratcheting Service Wrench has higher work efficiency and smoother maintenance actions. It does not need to be removed all the time for automatic adjustment. Air conditioning tools are specially designed for maintenance and use. They are compatible with air conditioning, refrigeration and other equipment. It is convenient to open and close the compressor maintenance valve, rotary lock valve and shut-off valve., Weight: 0.48942622164 Pounds, Manufacturer: NONDK