Hex Key Set, 7-In-1 Metric Small Fold-Up Allen Wrench Includes: 1. 5MM, 2MM, 2,5MM, 3MM, 4MM, 5MM & 6MM, Sizes Are Clearly Marked On The Handle For Easy Identification, Keys Are Held In Any Work Position Or Angle By A Flat Spring In The Bottom Of The Case, Made From 8650 Chrome Nickel Alloy Steel Drawn To A Tolerance Of Plus . 000/Minus . 001, Hex Corners Are Sharp & Clean.