I really like this product as I had seen it on a clients plane. I put it on mine where the spark plug wires had passed through the baffling deck via a hole with a grommet filled with silicone. Once I installed these it really gave a nice professional looking installation look. The holes where the wires are secured in are tight. It takes some pressure to fully close the halves together and ensure the small holes and pins on both ends line up and connect. Note: the holes are truly AN-3 sized. Good product overall.