S size: the plastic screw covers are about 9 mm/ 0.51 inches in diameter and 3.5 mm/ 0.16 inches in height, the diameter of holes is approx. 3 mm/ 0.16 inches; Note: they are small and please keep them away from little kids Convenient to use: the 2 parts of screw covers are attaches together, which make them convenient to use, simply pass screws through the hole on plastic screw caps, tighten the screws at proper positions you need and then close the cover caps Reliable material: the hinged screw covers are made of plastic, nice material is waterproof and durable, not easy to fade and suitable for long-term use, smooth surfaces makes the washer flip tops look neat Wide applications: the fold screw snap covers can be applied in home, school, yard, shops, offices and other places, the screw caps can provide your screws nice protection from rusting and decorate your furniture and wall Large quantity: you will get 100 pieces of plastic hinged screw covers caps in total, enough quantity for your daily use and replacement