Yes, plastic. It fits easily onto the front ridge doors, attach and screw in the "1/4" self-tapping screws, being careful not to bend them, they strained, I used to clip doors with 80 mil noico back then, so have I sealed the contact seam. The rear doors required light trimming of the mounting tabs on two of the three, making sure your holes didn't pull the adapter out of round shape. I used a 3/32" keyless drill to drill new holes to drill into the cut/shortened mounting tabs and two holes at the bottom 4 screws, not flexible, nice and flat yes they roll out easily tight (they won't be tight) on the speaker screws works like made for Infinity Kappas, who come to host Pioneer 6.75 d components, wish me luck, in any case, these adapters are perfect and everything is in stock, so feel free to take it and use yours n head. If you want big, deep custom mounts, use 1" MDF up front, but note that the tailgate trim has a gasket barrel that fits onto the mounting ring/speaker surround, you won't have room for spacers without dremeling that plastic ring with back of door panel.
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