These spark plug connectors are high quality as expected from NGK. I used them with 7mm wire and they worked perfectly with a dab of dielectric grease. Solid copper core wire is recommended since they are of a "screw on" type. No crimping needed.
Verified purchase: Yes | Condition: New
Use the in racing the vintage sleds, never had a problem, the plastic NGK do not work as well
Verified purchase: Yes | Condition: New
Works well for me have to remember to save clip couple pieces of paper and a vise got it done for me
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
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