KEN5839760K The sockets are manufactured from the highest quality chrome molybdenum steel which is clearly laser etched with the size for easy and rapid identification. Tough, impact-resistant carry case. Conforms to: Metric DIN 3129, Imperial SAE USA Federal Standard GGG-W-660A. Contents: Standard length: 6, 7, 8, 9, 10, 11, 12, 13 & 14mm. Accessories: 50 & 100mm extensions. 3/8"F to 1/4"M adaptor.