This effect can be easily confirmed, by examining vehicles that use hinge-caps over the number-plate fixings. Even on cars less than 6 months old, zinc-coated screws will show signs of advanced corrosion.

Fitting the Cap to the Washer may require more force. It may also result in a white 'stress' ring forming around the perimeter of the cap. The white ring may disappear over time, especially if the caps are warmed up. It all has to do with how gases and water vapour behave in enclosed spaces, and is governed by a few Laws of Physics, such as Boyle’s, Charles’, Dalton’s & Henry’s. In essence, once water enters a space (because it is not sealed properly) instead of the water evaporating out again later, it becomes water vapour and remains in the space for a much longer time.Ensure you are using the correct-sized Snap-Cap for the fixing. Some imported fixings may not conform to British or EU standards, and the heads of the fixings may be up to 40% oversized Snap-Caps are manufactured in Polypropylene. All materials used are 'food-grade' quality. Snap-Caps Dimensions

I need a method to cover screws for a high end client at a blue chip event and Snap-caps fitted the bill perfectly, not only was the product great the range of colours gave a perfect finish. The only problem i have was deciding what shade of blue to choose!!!!!! The fixings you are using are too large for the Washer. This prevents the Washer from flexing as the Cap is being pushed on.The large screw covers have an outside diameter of 5/8 inch. The large screw covers fit most screws in size #10, #12, #14, 1/4 inch, M5 and M6.

A great product and next day delivery every time. We are very happy with the service from Screw caps UK.

Finish off a sign in style with screw caps that actually match the colour of the sign! Our range of screw caps come in 2 sizes.