Greenhouse bubble clamps are a simple and inexpensive solution for temporary mounting coverings like bubble insulation, shade covers, etc. to the inside of your building (not recommended for exterior use). Simply attach clamps over the bubble and framing to lock in place. These heavy duty plastic spring clamps have 2 pivoting tips that easily rotate to fit uneven surfaces for more stable grip while avoid being scratched and are easy to adjust and remove as well. Clamps should be placed every 2' to 4'.