... -On, Welding Neck, Blind, Socket Welding, Threaded, Lap Joint and Plate etc.StandardASME, ANSI, API, JIS, JPI, DIN, UNI ... Control:Good quality control system which covers every process of the manufacturing-Raw material inspection, cutting, bending, sizing, shot ... will be compensated at the most prompt time. Any enquiries, you will get the soonest reply and the competitive price. Best regardssophia ...