You only need to pass the screw through the hole on the screw cap, tighten it, and close the cap. Hinged to aid cap retention during and after installation. It can be used safely both indoors and outdoors.
eBay
20 Pcs Car Wheel Nut Caps Protection Anti-Rust Auto Hub Car Tire Screw Caps Nut Bolt Covers Caps Exterior Decoration 17/19/21 mm
Aliexpress UK
Hinged to aid retention during and after installing. C O L O U R S : Black, white, light grey, dark grey, blue, number plate yellow, beige.
eBay
20PCS Car Wheel Nut Caps Accessories Auto Tyre Hub Screw Anti-Rust Protection Cover Decoration Cap Vehicle Bolts Studs Cap 21mm
Aliexpress UK
Corrugated Roofing Screw complete with Plastic Hinged Washer and Cap.
eBay
20 Pcs Car Wheel Nut Caps Protection Anti-Rust Auto Hub Car Tire Screw Caps Nut Bolt Covers Caps Exterior Decoration 17/19/21 mm
Aliexpress UK
Designed for both practicality and appearance, they neatly conceal the screw head and washer, giving a smooth, professional finish to your roofing, cladding, or panel installation. Choose the ideal option to achieve a seamless, coordinated look while maintaining high functionality.
eBay
20 Pcs Car Wheel Nut Caps Protection Anti-Rust Auto Hub Car Tire Screw Caps Nut Bolt Covers Caps Exterior Decoration 17/19/21 mm
Aliexpress UK
Colours and textures may vary, due to differences in the device used, to view the image. Can be over painted.
eBay
20Pcs Car Wheel Lug Bolt Center Nut Cap 17mm Wheel Nut Covers Cap Protection Covers Cap Anti-Rust Auto Hub Screw Cover
Aliexpress UK
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31PCS BOX for Tesla Model3 ModelY Juniper Cover Wheel Conversion Kit Car Wheel Hubcap Center Cap andTire Cap Screw Accessories
Aliexpress UK
They Will Suit Either Countersunk Pozi Star Head Wood Screws or Self Tapping Screws. Black - White - Grey.
eBay
20x Cone Liner Drum Cap Polycone Caps / Lids Screw Cap Black / White color 18mm 20mm 22mm 28mm
Aliexpress UK
(The fixing is secured through the washer into the workpiece. This provides an airtight and watertight seal that excludes atmosphere and protects the fastener head from rust and corrosion. a plastic washer (base), through which the screw or other fixing is inserted, and. ).
eBay
50pcs Replacement Wooden Bed Slat Plastic Middle Or End Holders 55mm Wooden Bed Slat Plastic Mid-caps Or End-cap Brackets
Aliexpress UK