1. Heat - insulation.
2. Non - absorbance.
3. Acid / alkali - proof.
4. Fireproof.
5. Shockproof environmental.
6. Energy - saving.
1. Model No: S20. 2. Bearing (kg): 83.81. 3. Screw diameter ( UD type): 8.5. 4. Specification (MM). 5. Inner diameter: 28. 6. Width (W): 25. 7. Thickness (t): 20.