9-In-1 Fold-Up Hex Key Set, Includes: 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32 & 1/4, 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, Made In USA.