We designed this sweet spark plug holder and cutter and fits most american spark plugs including hemi engines, LS and LT engines, and coyote engines. There is space to store a 5/8 hole saw and a spark plug socket on the tool and the threaded inserts are metal and replaceable in case there is ever an issue with threads. This is the last spark plug cutter you will ever need. These are all 3D printed from bright colors to make them easy to find and hard to lose. Can make from multiple different colors also.