First set includes long arm hex keys in sizes: .050 in., 1/16 in., 5/64 in., 3/32 in., 7/64 in., 1/8 in., 9/64 in., 5/32 in., 3/16 in., 7/32 in., 1/4 in., 5/16 in., and 3/8 in.. 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.