Description Time-Sert 48196 M18 x 1.5mm Seat Cutter. Time Sert seat cutter kits made in United States. Time Sert 48196 seat cutter kits. SPECIAL SEAT CUTTERS For use on some taper seat spark plug repairs that have very limited access to the spark plug hole. Cutter diameter .650 inches This tool only creates the inner countersink.