They have an excellent expansion effect, which is better than nail fasteners, can ensure long time using and prolong screws life. The ribs on the anchors expand on two opposing sides as you tighten the screw. Lightweight and portable, wide range of uses, installation quick and easy, improve work efficiency and installation quality. Features -Color: White. -Material: Plastic. -Size: About 4.00X1.00X0.80cm/1.57X0.39X0.31inch. -These wall anchors are in high elasticity, durability, good toughness and impact resistance, not easy to break. -Anti-rotation structure design of the expansion sleeve prevent the anchor from turning in the hole during installation. -Put the wall anchors into the holes and tighten the self tapping screws into the wall anchors. -Great for installing kitchen accessories, shelving, light fixtures, mirrors and other items to wall. -The ribs on the plastic anchors expand on two opposing sides as you tighten the screw. Package list: 200 x expansion screws