website:https://www.jhmindustry.com/
Shanghai Jian & Mei Industry and Trade Co., Ltd. is the company which manufacture and export fasteners and metal hardware, founded in 2006, with import-export authority. Now, 80% products export to all over the world and 20% sell in domestic market.
Roger from Atomic Athletic demonstrates Olympic Barbell Collars and which one to use in different situations. Roger shows spin-lock Olympic Collars and Set Screw Type Allen Collars