Resistant Finish: Features advanced electroplating with IP65 rustproof rating, ensuring long term in harsh outdoor or humid environments while extending tool lifespans by 3 times Versatile Size Option: Includes 4 size ( 17mm / 19mm / 21mm / 22mm) to accommodate various vehicle models and industrial applications, eliminating frequent tool changes for both professional mechanics and DIYer enthusiasts High Strength Construction: Made from heat treated steel with 300N·m torqued resistance, this impacts socket set delivers durability for automotive repairs and heavy machinery maintenance, outperforming traditional sockets User Friendly Features: Hexagonal recessed design increases area with patented pin hole mechanism, slippage during tire changes or equipment maintenance while ensuring secure attachment to power / pneumatic / hand tools Reinforced impacts Design: Thickened socket structure enhances shock absorption and reduces breakage risks, making it ideal for high industrial workplaces and heavy load operations without damaging bolts, Manufacturer: ERRORY