IMPACT Spline Bit Sockets Set 3/8" Drive Impact M4 - M14 Spline Key S2
M4, M5, M6, M7, M8, M9, M10, M12, M14. The Blue Spot Tools 9 PCE 3/8" impact spline bit sockets (M4-M14)are designed for use with 3/8" drive hand power and air tools. Bits manufactured from heat treated S2 steel.