No drilling, no screws, no nails and no glue, the utility wall hooks only just you peel off the cover starting from the bulge, then put the hooks on smooth surface like tile, glass, metal, wooden door, stainless steel.Our wall hooks have high strength sticky, and the stronger the wall, the more weight the adhesive hook can bear. These wall hooks heavy duty can be used as towel hooks, shower hooks,coat hooks, ceiling hooks, outdoor hooks, bird feeder hooks, key hooks, plant hooks, picture hooks and gardening tools This wall hook can be used for many purposes: tool hooks, coat hooks, key hooks, clothes hooks, towel hooks, also on wood, tile, ceramic, metal, plastic surfaces etc. (please note that there are restrictions on painted walls)! These versatile wall hooks are perfect for various uses: robe hooks, coat hooks, key hooks, clothing hooks, and towel hooks. Ideal for outdoor applications.