Includes short arm hex keys in sizes: .050", 1/16", 5/64", 3/32", 7/64", 1/8", 5/32", 3/16", and 7/32". Includes long arm hex keys in sizes: 1/16", 5/64", 3/32", 1/8", 9/64", 5/32", 3/16", 1/4", and 5/16". Keys are made of 8650 chrome nickel alloy steel for maximum performance. Keys come in plastic holder that firmly retains keys in size marked holes. Slide blister packaging is reuasable for storage on pegboard by user.