6069 - knife buttonholing 22 mm = 7/8",HSS - B2702-047-P00 7/8, Durkopp 551, Durkopp 555, Durkopp 556, Brother 812 , Brother 814 JUKI 761 , JUKI 763 , JUKI 773, Minerva 73403 , Minerva 62761 , Minerva P3Z Singer 71-1, 3, 5, 6,71-30,71-40,101, Singer 271-K11,-K13,371,471, Garudan.