1Hex Screw Protective Caps: Made of premium silicone material, sturdy and environment friendly, hex screw head protector can prevent screws from rust, water, and dust, improving product appearance. 2Easy Installation: These hex screw bolt covers are easy to install and remove, waterproof and dustproof, protecting screws from various damage and maintaining them in good condition. 3Wide Application: Hexagonal screw bolt covers provide effective guard and enhance product appearance, suitable for high strength fasteners in machinery, furniture, vehicles, and other fields. 4Silicone Material: These hex screw protective caps is made of excellent silicone material, ensuring long lasting durability, wear and tear resistance, erosion resistance, and no deformation. 550 Pieces in 1 Set: This kit includes 50 pieces silicone hex screw covers with standard thread to ensure stable and reliable installation, making it convenient to use and replace at any time. 50 x Hex Screw Caps