... steel galvanization silk.Outside diameter: 4 inches, 6 inches, 8 inches, 10 inches, 12 inches, etc. (20mm ... - 1000mm) Slot: 0.1 mm - 35mm deviation: 0.05 mmStandard length: 50-6000mm ... mm, 2.3 * 3.0 mm, 3.0 * 4.6 mm, 3.0 * 5.0 mm, etc The specification: Torre 3.8 mm / 22 root, 380 mm ... / 32 root, 380 mm / 48 root, 380 mm / ...