Metric only colour coded blueHandy storage railCr-V steel with mirror polish finish1/2" square driveThis handy 10 piece 1/2" Drive Metric Clip Rail Socket Set offers the most common metric sizes in a small compact set. For all those times when you don't want to purchase larger more expensive socket sets, you can now easily get what you need out of these sets. All made from Cr-V steel and with the unique colour coded blue (for metric) system. Very handy for odds and end jobs. Sockets are securely stored in a handy rail, to help avoid losing loose sockets.Contents:1/2" Drive Metric Sockets: 10, 12, 13, 14, 15, 17, 18, 19, 21, 24mm