Vintage Singer sewing machine buttonholer attachment templates - This is the set of 5 templates that would have originally came with your buttonholer, it includes the 5/16", 5/8", 13/16", 1-1/16" and 1-1/16" keyhole templates. I find that many buttonholer sets are missing a template or two, this will help complete your set. Simanco part 160548, 160549, 160550, 160551, 160552