These handy sets fit in your pocket and help eliminate the lost key problem. Tough, heat treated chrome nickel alloy steel. Hex key ends are square cut for a secure full depth fit and maximum contact with the hex socket. Holder serves as a handle. Folding hex keys can be used straight out or at a right angle for extra leverage.Nine key set has a handle length of 4 1/4″. Key lengths are 1 3/4″ to 3 1/2″.Sizes: 5/64″, 3/32″, 7/64″, 1/8″, 9/64″, 5/32″, 3/16″, 7/32″, and 1/4″.