... 25 , 1.5 , 1.75 , 2.0 , 2.5 , 30 and UNF etc.Shape : round , arc , square etc.Surface treatment: Black coating ... we are a company by introducing technologies including research and development, production and sales. We always focus on the quality of products ... , continually improve manufacturing technology. With reliable quality and sincere service, we win the trust of customers. Our ...