A quality EIGHT piece spline bit socket set. Manufactured from Chrome Vanadium Steel (CR-V) for longevity and durability and helps resist abrasion, oxidation and corrosion. Each socket has a knurled band around the outside for a secure grip. The sizes are stamped onto each socket for easy identification. Each set contains the sizes M4, M5, and M6 for the 1/4" drive sockets and M8, M10, M12, M14 and M16 for the 3/8" drive sockets. Also included is a handy socket holder rail for convenient grouping and storage.