This is one of a comprehensive range of Premier Hand Tools by Sealey, suitable for daily professional use. It contains forged Chrome Vanadium steel sockets with S2 steel hex bits. The sockets are heat more→treated and chrome plated with a fully polished mirror finish whilst knurled rings assist the gripping of the sockets with oily fingers. The contents come supplied in EVA tray. Contents: 3/8"Sq Drive (50mm) Socket Bits; Spline - M4, M5, M6, M8, M10, M12, TRX-Star* - T10, T15, T20, T25, T27, T30, T40, T45, T47, T50, Hex - 4, 5, 6, 7, 8, 10