Product Main Ingredients: Steel, Plastic (HDPE) Product quality: The products implement API Q1 quality inspection standards. Product design refer to API 5CT Appendix I requirements. (Smooth surface threads without broken buckle, no impurities, no slippage, no bonding with steel pipe threads, can be applied to -46 degrees to 66 degrees environment) Product Usage: This product is a necessary supporting product for oil-specific drill pipes, drilling tools, etc. It plays the role of protecting the steel pipe threads. Prevent the threaded end of the pipe from being damaged during loading and unloading, transportation and storage.