The adapter is for 8mm shank dial indicators, which is not included, this sale is only for the adapter. Check other listing for 3/8in shank adapter.

Comes with two length pins for NGK "E" and "H" length heads.

This product is 3D printed plastic, do not over tighten. Over tightening is not required for measuring purposes and may damage product.

Indicator body is 46mm from spark plug base (when slid lowest on collet), make sure this is long enough to clear any head fins or obstructions before ordering.