This is a metal disc with grade markings on it - just what I wanted. It's worth noting that the intake/exhaust marks are set for a left hand turning engine if I'm not mistaken. I haven't used it to calibrate the camshaft just to find true TDC. Revain shipped it in a really ridiculous amount of packaging, a 12" x 8" x 3" box (roughly) and tons of packaging material.
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