Klutch Metric Hex Bit Socket Set - 13-Pc. Strong, durable S2 alloy steel bits 1/4in. drive socket set includes 2, 2.5, 3, 4, 5 and 5.5mm sizes 3/8in. drive socket set includes 6, 7, 8, 9 and 10mm sizes 1/2in. drive socket set includes 11 and 12mm sizes Anodized magnetic aluminum socket rail