One-piece Chrome Vanadium steel socket bits. Sockets are heat treated, chrome plated and satin finished. Knurled rings assist the gripping of the sockets with oily fingers. Supplied on socket rail. Features: One of a comprehensive range of Premier Hand Tools, suitable for daily professional use One-piece Chrome Vanadium steel socket bits Sockets are heat treated, chrome plated and satin finished Knurled rings assist the gripping of the sockets with oily fingers Contents: 8, 10, 12, 14, 17, 19mm Supplied on socket rail Lifetime guarantee* Specifications: Guarantee:Life Model Number: AK6561