Application Requirement : Non-concave and convex smooth hard surface, wood based building materials, metal decorative surface, stainless steel surface, plastic decorative surface, glass surface, wall column, ceramic tile, refrigerator, washing machine, metal coated surface and etc. Caution: -Remove dust or dirt on the surface before fixing the hook. -Do not use on plaster wall, water-based coated surface, rough and bumpy surface. -Avoid applying excessive load. -Do not hang breakable or valuable goods. -Only use for objects in vertical direction. -The strength of the hook is dependent on the surface. -Keep away from children. -Do not use near high temperature area. -Do not use this product for purposes other than its original purposes.