Plastic coating: The plastic coating on these cup hooks protects hanging objects from scratches, and prevent the hook from rusting. Usage: These screw hooks can be used to hold cups, mugs, flower pots, and also suitable for lamps, curtains, chains, flower pots, etc. Quantity: 25 pieces of plastic coated ceiling hooks are included for your daily use and replacement needs. Screw-in Hooks: These screw-in hooks have threaded prongs for easy screwing into wood or walls. Application: These open cup hooks are suitable for indoor and outdoor use, widely used in home and office, creating extra space for home, school and office