Manufacturer: uxcell. Compatible Fastener Range: T30 Torx screws. Size: 3/8″ T30. Drive System: Torx. [Durable] – Quenched and heat treated S2 alloy steel bits, high hardness, reduce wear-outs. [Torque Strength] – Complete corrosion resistance and rust resistance, mirror-polished and nickel-plated sockets and phosphate bits finish.