A thin film of pure formvar resin coats a single hole grid.. Gilder finder grid. F1 Type. Gold. Pack of 50. . EMS FCF200F1-Au-EB Formvar/Carbon Support Film, Gilder Finder Grid, F1 Type, 25-50nm Thick Formvar and 3-4nm Thick Carbon, Gold, Pack of 50. Country of Origin : United States. Part Number : 1172X45PK. Pack of : 50.