1/2″ SOCKET SET: Set included: 8、9、10、11、12、13、14、15、16、17、18、19、20、21、22mm deep & shallow sockets ; 5″, 10″extension bar; 1/2″ universal joint. The extension bar can help you turn the bolts and nuts located in the deep recessed part. Suitable for the maintenance of various types of fasteners on the vehicle.SUPERIOR CR-V STEEL: Constructed with heat-treated forged chrome vanadium steel, our 1/2″ impact socket set has high hardness and durability, and can withstand greater torque from impact tools. The sturdy and professional chrome vanadium alloy structure allows you to undertake different projectsDURABLE & LASER MARKING: Different from the traditional black oxide coating, BOEN impact socket set 1/2 dirve adopts black manganese phosphate coating to provide excellent corrosion resistance and rust resistance for long-term use. Laser markings make all model numbers easy to keep, read and quick identification.800N.m POWER WRENCH: The high-performance 5215 brushless motor transmits a maximum torque 600FT-LBS(800N.m) and max breakaway torque 750FT-LBS(1000N.m), which can even loosen stubborn nut within a few seconds. Using this electric wrench can significantly shorten your working time.4-SPEED MODE ADJUSTABLE: The 1/2 impact wrench supports 3 speeds from 0-950/1500/2200RPM adjustment to meet different work needs. The difference is that the minimum speed is reduced to 0-950 RPM. It can slowly remove nuts to avoid excessive torque damage to sockets and nuts. It is very friendly for beginners.