Professional tool for commercial or occasional use. Manufactured from chrome vanadium steel for strength and durability. Hardened steel for strength when using. Combination spanner which means that one side of the spanner is open and one of the ends is closed. Satin finish for rust and corrosion resistance. AF / Imperial sizes Set Includes; : 1/4" / 5/16" / 3/8" / 7/16" / 1/2" / 9/16" / 5/8" / 11/16" / 3/4" / 7/8" / 15/16" and 1"