Includes hex key wrenches 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 holder that firmly retains keys in size marked holes. Slide blister packaging is reusable for storage on pegboard by the user.