they are like an 1/8 in thick. takes some force to snap, sometimes they just bend. I would say they will hold up to heat and weather quite well. I've only seen these get brittle after 2-3 years. I'm not done yet, i didn't grab enough zipties from work so there is only one in a bottom hole, the two behind the lights are resting on them. I think i'll leave the passenger side behind the light open for the trans cooler. Still debating on whether or not i should attempt the bottom mess of a hole.
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Randy
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