Features and Benefits:�CR-V alloy steel for long life�Lifetime warranty�Radius corners in the box end to grip the flats of the fastener and prevent round off�Heat treated and tempered to meet or exceed ANSI Standards for strength�Chrome plating for strength and rust preventionThis Sunex 34mm jumbo combination wrench will give you years of usage. It comes with a lifetime warranty which backs the craftsmanship of this CR-MO alloy steel product. It will meet your needs and is at a great value.