Surface 2x nickel-plated and 1x chrome-plated, polished heads, 8-piece. Torque values are higher than required by DIN/ISO. Each piece is calibrated and quality-checked. Forged from CR-V steel. According to DIN 838 and ISO 3318. Consisting of: SW 6 x 7 - 8 x 9 - 10 x 11 - 12 x 13 - 14 x 15 - 16 x 17 - 18 x 19 - 20 x 22 mm Note: Each wrench has its fixed place, snapped into a plastic base that can also be mounted on the wall. Type Item Design Double ring Features polished, chrome-plated, nickel-plated Main color silver Wrench size 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 22 mm