Scotch, 2.0" x 10 YD, 50.8 mm x 9, 1M, Foil Tape, 3311 Is Ideal For Sealing Joints & Seams Against Moisture & Vapor On Foil Jacketing Insulation, Can Also Be Used In General Maintenance & Automotive Repair. Scotch (R) Foil Tape 3311 Is Ideal For Sealing Joints And Seams Against Moisture And Vapor On Foil Jacketing Insulation. It Can Also Be Used In General Maintenance And Automotive Repair. 2.0 In X 10 Yd ( 50.8 Mm X 9, 1 M).