Your looking at a very unique and useful set of sockets, this is a METRIC flexible socket set.
All these sockets are 3/8" drive and feature a 6-point drive end.
These are made from chrome vanadium steel that is hardened and chrome plated for corrosion resistance.
Set Includes:
10, 11, 12, 13, 15, 16, and 18mm sockets.
