Manufactured from chrome vanadium steel that's hardened and tempered. Packed in steel case. Contents: 10 x Hex keys: 3 x 124, 4 x 138, 5 x 158, 5.5 x 168, 6 x 178, 8 x 197, 10 x 221, 12 x 248, 14 x 278, 17 x 318mm...