Visit My eBay Store: discount_toolStarrettPT24921 Flat Back for 81 Series Dial IndicatorsPLASTIC CONSTRUCTIONThe picture of the indicator is for reference as to the type of tool this back goes on to - tool sold separately.PLEASE NOTE: WE ARE CLOSED ON SATURDAYS & SUNDAYS AND THEREFORE MAY NOT ALWAYS RESPOND TO OFFERS.