The Matco Tools 8-pc 1/4" and 3/8" Drive Metric Hex Ball Bit Socket Set, No. SABBXM8V, is manufactured with S2 steel and finished with zinc phosphate coating for corrosion resistance. High-visibility markings include two black rings for easy ADV distinction. The set includes 1/4" drive 4mm, 5mm, 6mm and 3/8" Drive: 7mm, 8mm, 9mm, 10mm, 11mm.