I've tried mounting them on regular 13mm bolt heads under the hood. Follow the instructions, use the right sleeves. One of the six bushings caught on one of the screw heads, the rest just fell off. Try to put on hats with sleeves. They all fell. I also tried using 12mm cases but of course they were too small. I suppose if you fill the caps with silicone and stick them on you can hold them in place, but that's not how they should work. So all in all a big failure. To be honest they might fit 1/2" bolt heads but they don't fit 13mm. and 13mm bolts. The packaging was the same (see photo). They have since updated the online description to say that they only work with 1/2" screws. Glad to see Specter is listening to Revain's feedback. π
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