1. Reliable, wearable, good quality, 2. low noise; 3. Z=0-200, M=0-4, diameter 0-600mm. 4. material PA46 Tooth (Z)Modul(M)Diameter(Φ)Normal Press Angle(a)HandQuality (Chinese standard)Purpose1-2000-60-600mm20°, 25° or according to the customer's requirment.Right or LeftGB7, GB 6, GB 5, GB4Auto Electric Power Steering (EPS)Note: 1.The worm shft material can be 40Cr, 45#, 42CrMo, PA46 etc.or ...