Features and benefits: forged from the finest chrome molybdenum alloy steel the best choice for strength and durabilityradius corner design - to extend the life of fastenersincluded in a heavy molded storage trayfully guaranteedno doubt, sunex tools offer one of the most complete and toughest impact socket lines around. This metric 1/2in drive, 6 point impact socket set is designed to tackle the toughest jobs with solid durability and keeps them pounding job after job. Also each socket features a radius corner design, causing the socket to grab the sturdy wall of the fastener instead of grabbing the corners, resulting in less wear on the fastener. The following sizes include: 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm and 19mm.