Features: The 20PC 3/8" Drive Extra Long Allen Hex Bit sockets Set features stable steel construction, offering a comprehensive ranges of metric (3mm 12mm) and british (1/8'' 7/16'') size for accuracy tasks. Each sockets undergoes machining for unflawed hex bit compatibility, while the corrosion resistant finish and delicate storage case ensures long time durability and organized portability. Ideal for professional mechanics, DIY enthusiasts, and technicians requiring reliable torques transmission in tight space during automotive repairs or equipment maintenance. Tackle stubborn fasteners in automotive engines, industrial machinery, or furniture assembly projects with the extended 3/8" drive design that enhances leverages and reduces hand strain. This multifunctional Allen sockets set combines nonslip grooves, clear size marking, and heat treated strength to prevent rounding of bolts, making it a workshop essential for metric and british applications. Specifications: Material: Steel Outer Box Size:Approx. 245x160x55mm/9.64x6.29x2.16inches Weight: 1650g Sleeve Length:Approx. 110mm/4.33inches British: 1/8--7/16 Metric System: H3--H12 Package Includes: 20Pcs Hexagonal Sleeve Set note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.