They are useless. The hole is approximately 9mm or 3/8 inch. The material is very hard and doesn't stick well to the silicone tip of the bottle, it just falls off.
Gorilla Tough And Wide Silver Duct Tape, 2.88" X 25Yd - Pack Of 1 For Superior Strength And Durability
23 Review
Industrial-Strength Double-Sided Woodworking Tape, 4"X30 Yards Yellow CNC Machine Tape For Woodworkers And Crafters - Removable Woodturner'S Tape From XFasten
52 Review
High Tensile Strength Duct Tape Silver, 5.8mils, 2 Inches x 50 Yards - All-Weather Duct Repair Tape for Commercial Use, Heavy-Duty Repair, Packing with Temperature and Shear Stress Resistance - XFasten
39 Review
Transparent Cross Strapping Tape: XFasten Filament Duct Tape 2X30 Yards - 3 Pack
29 Review