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A package of ten, 45-degree, 3D-printed, spark plug boots.
When cutting the boot from the tree, a stem remains to insert into the head's spark plug hole (use a #70 drill bit).
The hollow end accepts Pro Tech's Spark Plug Wire. Pro Tech recommends drilling the boot hole with a #74 drill bit (see their instructions on the back of the header card).
I ordered both the 45° and 90° spark plug boots. I am very happy with both the quality and the accuracy of the product. The gast shipping and fair price was a bonus