A thin film of pure formvar resin coats a single hole grid.. Gilder finder grid. F1 Type. Nickel. Pack of 50. . EMS FCF200F1-Ni-SC Formvar/Carbon Support Film, Gilder Finder Grid, F1 Type, 10nm Thick Formvar and 20-30nm Thick Carbon, Nickel, Pack of 50. Country of Origin : United States. Part Number : 1172X26PK. Pack of : 50.