... steel grit is professionally manufactured by Shanghai Bosun Abrasive Co., Ltd in china mainland, with 23 years' experince in ... 9020-9020-9030-8020-5020-6080-100Company ProfileShanghai Bosun Abrasive Co., Ltd. is a professional abrasive company, which can research, ... in shipbuilding, container, automobile, steel, foundry, machinery, mining, stone and other industries, which has sold to more than 20 ...