Forged from the finest chrome molybdenum alloy steel – the best choice for strength and durabilityRadius corner design - to extend the life of fastenersHeavy molded storage trayFully guaranteedNo doubt, Sunex tools offer one of the most complete and toughest Impact Socket lines around. This 3/8" drive, universal impact socket set is designed to tackle the toughest jobs with solid durability and keeps them pounding job after job. Also it 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 are included: 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm and 19mm.