Sealey 42 piece spline socket bit set 1 2 sq drive sealey premier ak706 chrome vanadium steel spline sockets hardened and heat treated for strength half chrome satin finish with knurled ring for corrosion resistance and extra grip even with oily fingers all sockets are equivalent to metric hex and bi hex sockets with many being also equivalent to imperial hex imperial bi hex and trx star sockets set also includes hex bits extension bars 3 8in f 1 2in m sq drive t bar adaptor bi