Set Includes: 4, 5, 5.5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15mm Product Features:Off-corner loading design reduces fastener roundingChamfered opening quickly guides fasteners into socketHard stamped size markingsSingle line (SAE) and knurled (metric) ring help easily identify standard and metric sockets