Running a key duplicating machine? This is a replacement cutting wheel (or tracer point) for your machine. The model is CW-90MC, and it's made from High-Speed Steel (HSS), which stays sharp through cutting many keys. It's specifically designed to fit several popular key machine models: the HPC 1200 series (like the 1200CM), the Ilco Universal II, and the Lagard LG1011. If your current cutter is dull, chipped, or just not cutting cleanly anymore, swapping in a fresh one like this will get your machine making perfect, smooth keys again. It's a single piece (as described). Installation usually involves removing a retaining nut or screw on your machine, swapping the old cutter for this one, and tightening it back down. Make absolutely sure your machine model is listed before buying, as cutters are not universal. A must-have maintenance item for any locksmith or hardware store that duplicates keys.