24PCS Bolt Nut Protection Cap Black Hexagon Dome Nylon Bolt Nut Protection Cover M8x14 mm

I used these to cover nuts on an outside metal porch railing. These are 14mm (by 8) caps. I used them on 9/16 inch nuts. The caps are made of (I think) nylon so they can “stretch” a bit. I had to use a hammer to get them on but they fit perfect and very tight so they won’t come off. Looks great with the black railing.

Works Great

I needed one to replace a missing piece on my windshield wiper arm. It did the job but now I have 23 spares.

Snugly fits our 14mm lag bolt head (when measured from flat edge to opposite flat edge) despite other reviews. It took some effort to install the caps on the bolt, but also means it will take some effort to get the caps off the bolt, which is ideal for my application. Measurement out of the box doesn’t appear to match the bolt head size, but it stretched to fit when aligned properly with the hex bolt and with significant force applied. We have had these installed for three weeks in high traffic area (stairwell) with none of the caps coming loose or falling off even without using adhesive. Gives our stair brackets a finished look without having to mess with paint or other aesthetic remedies. Very satisfied.

Works for what I needed

These are advertised to fit 13 mm nuts or bolted they are way too loose they just fall right off bad manufacturing no quality control avoid this product

These are very tight fit I had to put them in boiling water to make them fit. And then after I installed over half of them I found there was one deformed like you see in the photo so I was not able to finish my project and I have to order a whole new package

I hated the silver bolt heads securing the gazebo to my trex deck. These were perfect. Very tight fit (just tapped on using a rubber mallet though) and now the hardware blends in perfectly.