Hex-Key Wrench 5 piece set. Conveniently folds for storage in a pouch or toolbox. Each hex key is heat treated and tempered for extra strength and durability. Sizes include 3/16", 7/32", 1/4", 5/16" and 3/8". Powder coated case for corrosion resistance and long life. Designed to exceed ASME/ANSI specifications. Lifetime limited warranty.