Crescent Metric Socket *Drive Size: 1/2 in. Drive in. drive *Metric or SAE: 20 mm *Number of Points: 12 Point *Style: Standard *Product Type: Socket *Material: Chrome Vanadium Alloy Steel *Packaging Type: Carded *Length: 1.69 in. *Specially formulated and heat-treated for high strength and superior resistance to abrasion and corrosion