Hardened and tempered, chrome molybdenum steel
SAE 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"
Metric sizes: 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm and 8mm
Each assortment features a plastic clamshell storage case