Crescent Deep Socket *Socket Size: 5/16 in. *Drive Size: 3/8 in. *Metric or SAE: SAE *Number of Points: 6 Point *Style:Deep *Product Type: Socket *Number in Package: 1 pc. *Packaging Type: Carded *Impact Rated: No *Length: 1.69 in. *Material: Chrome Vanadium Alloy Steel *Specially formulated and heat-treated for high strength and superior resistance to abrasion and corrosion