Sealey 13 piece spline socket set 1 4 sq total drive sealey premier ak69813 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 rail mounted for ease of storage and socket selection sealey ak69813 spline socket set