... pins,sheel pin, double cone pin (Forging blank&finish maching) for drilling rigs We are professional manufacturer of oil ... are widely used in boiler pressure vessel, oil industry, chemical field, shipbuilding, pharmacy, metallurgy, water conservation, power plant, pipe ... accessories and so on. Welcome to contact me for further discussion.Paul JingSales managerZhangqiu Baohua Forging Co.,LtdTel: ...