worm wheel 1. Anti-corrosion 2. Environmental protection 3. material:brass 4. minimum tolerance: +/-0.0001mm worm wheelOuter diameter: 300mminner diameter 240mm1. Anti-corrosion 2. Environmental protection 3. material:brass4. minimum tolerance: +/-0.01mm 1):Aplication:automotive, electronic, telecommunications, mechanical products, medical devices, etc.;2):Material: Iron/Alluminum, Copper, Alloy, ...