Made from impact grade chrome molybdenum alloy steel. Fully guaranteed. Includes heavy duty blow molded case - over 30" tall. Includes wheel kit and grip handle for easy maneuvering Because of the extended size range of this set and the deep length of the industrial grade Cr-Mo steel, this set is extremely heavy; thus, we have added a wheel kit for added convenience that enables the user to pull the set behind them to the desired workspace. All sockets in this set are fully guaranteed. 6 point deep socket sizes include: 3/4", 13/16", 7/8", 15/16", 1", 1-1/16", 1-1/8", 1-3/16", 1-1/4", 1-5/16", 1-3/8", 1-7/16", 1-1/2", 1-9/16", 1-5/8", 1-11/16", 1-3/4", 1-13/16", 1-7/8", 1-15/16", 2", 2-1/16", 2-1/8", 2-3/16", 2-1/4", 2-5/16", 2-3/8", 2-7/16" and 2-1/2".