The bits are crafted from S2 alloy steel, offering high hardness and durability, while the Chrome-vanadium (Cr-V) sockets deliver superior torque for powerful driving performance. This 3/8-inch drive extra-long hex bit socket set includes: (Sae) 1/8"", 5/32"", 3/16"", 7/32"", 1/4"", 9/32"", 5/16"", 3/8"" (Metric) 3mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 7mm, 8mm, 9mm, 10mm. The extended design allows for easy access to confined or recessed work areas. Precision-chamfered bit tips ensure smooth insertion. Size markings are large, clear, and stamped for easy identification and wear resistance. Includes a rugged blow-molded case for convenient portability. Meets or exceeds Ansi performance standards. Weight: 3.78 lbs.