Drop-forged Chrome Vanadium steel sockets with S2 steel TRX-Star* bits. Sockets heat treated & chrome plated for resistance to corrosion. Dual satin/chrome finish with knurled ring to assist gripping with oily fingers. Contents: T10, T15, T20, T25, T27, T30, T40, T45, T47, T50, T55, T60. Supplied on socket rail. Model No. AK6221