First set includes long arm hex keys in sizes:

050", 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16", and 3/8"

Second set includes short arm metric hex keys in sizes: 1

5mm, 2mm, 2

5mm, 3mm, 4mm, 5mm, 6mm, 8mm, and 10mm

Keys are made of 8650 chrome nickel alloy steel for maximum performance

Keys come in plastic holders that firmly retain the keys in sized marked holes