Manufactured from chrome vanadium steel that's hardened and tempered. Fitted in pocket - size plastic storage holder with non - slip grip. Features and Benefits • Contents: 1.5-8.0mm • Chrome vanadium steel hardened and tempered • Held in pocket-size plastic storage holder with non-slip grip Contents 8 x Hex keys: 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 8.0mm