The BlueSpot 7 Piece 3/8" Drive Extra Long Spline Socket Bit Set is manufactured from chrome vanadium steel for increased durability. Features an extra-long 110mm shaft for accessing hard to reach areas that conventional bits cannot reach. Manufactured from Chrome Vanadium Steel for increased durability. Extra-long 110mm shaft to access hard to reach areas. 3/8" Square Drive. Package Contents: M4 M5 M6 M7 M8 M9 & M10.