18 piece, combination short & long arm hex-l key set, includes short: .050", 1/16", 5/64", 3/32", 7/64", 1/8", 5/32", 3/16" & 7/32", includes long: 1/16", 5/64", 3/32", 1/8", 9/64", 5/32", 3/16", 1/4" & 5/16", made of 8650 chrome nickel alloy steel, black oxide finish to resist rust, corners are sharp & clean.