• Set of 7 high-quality Allen keys. • Material: alloy steel. • Color: black. • Diameter: 0.7 mm to 3 mm. • Sizes: 63 x 20 mm x 3 mm, 57 x 17 mm x 2.5 mm, 52 x 16 mm x 2 mm, 47 x 14 mm x 1.5 mm, 40 x 14 mm x 1.3 mm, 40 x 13 mm x 0.9 mm, 40 x 14 mm x 0.7 mm. • Hard and durable. • Surface treatment blackening. • High strength and toughness. • Wear and oxidation resistance. • Use within the specified cutting range. • Place in a dry environment and clean with a dry cloth.