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By certification 
1.In accordance with API 8A and 8c specifications.
2. The sheave rope groove goes through quenched processing with wear resistance and long life.
3. Sheaves and bearings can be exchanged with the sheaves and bearings of its allocated crown.
2. The sheave rope groove goes through quenched processing with wear resistance and long life.
3. Sheaves and bearings can be exchanged with the sheaves and bearings of its allocated crown.
