1/2 IMPACT SOCKET SET: The high impact grade components of this master kit are constructed of drop-forged premium chrome vanadium Cr-V steel to withstand extreme levels of torque changes against fasteners. 6 POINT DEEP IMPACT SOCKET SET: The 6-Point hex socket design prevents round-off on nuts and bolts under high torque exertion and hammering stress from the use of an impact wrench or electric wrench with a strong output. HIGH VISIBILITY SHALLOW IMPACT SOCKET SET: The highly visible laser-etched markings on the black phosphate finish makes it easy to identify drive socket sizes and measurements to allow for fast application, efficiency, and accuracy in your automotive workspace. STORAGE CASE: The included socket set case is blow molded to fit each individual socket size and features labels for organized storage with secure lever locks to prevent opening accidentally at the job site. INCLUDES: Sizes - (40) Deep and Standard Length Metric Impact Sockets: 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 30, 32mm; (3) 1/2 Extension Bars: 3, 5, 10-inch; (1) 1/2 Ball-Type Universal Joint; (1) 3/8" (F) to 1/2" (M) Adapter.