The QWORK sprocket teeth are worth every penny! According to my experience in the industrial and scientific field the product has impressed me with its durability and quality .These roller chain sprockets have a smooth finish and have facilitated our machinery`s smooth functioning. The teeth are PRECISELY cut, and thus, our production has been efficient. however, the installation process was a bit tricky and time-consuming. Nevertheless, it is a small drawback compared to the benefits these sprocket teeth have brought to our work environment. Highly recommended!