Product Details UL Listed Door Coordinator When active door is open, coordinator prevents active door from closing until inactive door closes. Closing of inactive door causes strike plate on top of door to contact cam and lift arm, allowing active door to close. As inactive door continues closing, roller rides over strike plate on to door bracket, holding arm above active door. SS304 casting door coordinator UL Door Coordinator Certificate NO.: R38853 SS304 main body SS304 swing arm Satin Stainless steel finish; 1pc/polybag; 1 pc/color box; 30 pcs/carton