SKILCRAFT Pro-Grade socket sets are made of high-grade chrome nickel steel. Sockets feature lobular openings for greater turning power without deforming the fastener. Designed for quick engagement on both 6 and 12-point fasteners. Included accessories feature unique finger fit handles, narrow pear-shaped head on socket wrench heads for ease of access into confined work areas, ball and spring socket retention, and a high polish chrome finish for easy cleaning. Sockets come in custom foam trays for easy toolbox organization. Limited lifetime warranty. 12 piece set includes, 6 point 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, and 19mm deep sockets.