Chrome Vanadium Steel ✔METRIC & STANDARD SOCKET SET: LLNDEI 3/8-inch Impact socket set includes both metric and standard sizes and 1/4-inch bits and full complement of extensions and to fit any and all measurements you encounter on the job or home repair! ✔HEAVY-DUTY 3/8" IMPACT SOCKETS: Each black socket and socket extension in this master kit is constructed with high-impact drop-forged premium chrome vanadium steel. The sturdy and professional chrome vanadium construction allows you to take on any project, large or small. ✔MASTER SET INCLUDES: 1x 3/8" U-Joint; 1x 3/8” Quick Release Ratchet Handle low-profile, 72T; 28-Metric Deep and Shallow Sockets: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22mm; 16- SAE Deep and Shallow Sockets: 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4”; 2-SAE Spark Plug Sockets: 13/16, 5/8; 2x 3/8” Extension Bars: 3”, 6”; 1x T-Bar Adaptor; 1-piece 3/8F*1/4M Adaptor; 1x Spinner Handle; 1x Coupler for Bit; 40x Bits; 1x 3/8” Socket Adapter for power tools. ✔6-POINT HEX DESIGN: The 6-point hex socket design prevents round off on fasteners under high torque exertion from an impact gun or electric wrench output. The included socket set case holds each socket for easy transport and storage. ✔LASER ETCHED SIZES: LLNDEI impact sockets are each individually identifiable with high-contrast laser etched markings for the easy identification of sizes to keep you working at home or the garage on your car or vehicle. This design allows for fast application, efficiency, and accuracy in any work space. ✔SERVICE GUARANTEE: All LLNDEI sockets are rigorously tested, ensuring peak performance and durability. LLNDEI Tools meet or exceed ANSI and DIN performance standards. It comes with Lifetime Warranty. If you break a single socket, please feel free to contact us.