This Snap-on socket set includes 7 sockets ranging from 4mm to 10mm in size, with a 3/8in. The hex/allen drive type is perfect for allen keys and the standard socket type makes it easy to use with a variety of tools. The set comes in a compact design, making it easy to store and transport. The sockets are made by Snap-on, a well-known brand in the automotive industry. This socket set is perfect for anyone looking to improve their tool collection and make repairs on their vehicle. Is on a rail however one side of the rail has lost the rubber stopper so tape is on there to prevent sockets falling off.