Cr-Mo ALLOY STEEL - Cr-Mo impact socket star bits feature with added strength, higher working temperatures and corrosion resistance. They’re much stronger to stand greater impact force than Cr-V ones. COLD FORGING & HEAT TREATMENT - Cold forging and heat treatment greatly improve the performance of the drive impact sockets torx bit with enhanced hardness, increased wear-resistance and lifespan. ONE-PIECE CONSTRUCTION & PIN HOLE DESIGN - The integrated structure is more durable to stand a higher torque. They’re compatible with socket retaining pins & O-rings to add extra security during use. BLACK PHOSPHATING - A fine and dense coating on the surface will bring more corrosion and wear resistance for longtime use. PRECISE FIT - Adopting precise machining, the torx head with strict tolerance control provides an exact fit to stand high torque. The set includes size from T30, T40, T45, T47, T50, T55, T60 to T70.
