These rings were specially developed to use a screw (even sheet metal screws) as a captive connecting element, to protect surfaces of sensitive instruments, to construct temporary connections without nuts or to attach washers to screws captively before using a automatic screw driver.
*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.