If you need to cut through tough materials like tile, fiberglass, or stone, this MK Morse C.GRIT hole saw is the real deal. The 1 3/8 inch size is perfect for various plumbing and electrical applications where you need clean, precise holes. Unlike traditional hole saws with teeth, this uses carbide grit embedded in the cutting edge that basically grinds through hard materials rather than cutting them. This means no chipping on brittle surfaces and much smoother results. The build quality is typical MK Morse - professional grade and built to last through repeated use. It works great with most standard drills, though you'll want to run it at moderate speeds with steady pressure for best results. The grit coating holds up well and doesn't wear down quickly like cheaper alternatives. Whether you're installing pipes, running cables, or working on DIY projects involving tough materials, this hole saw makes what could be a frustrating job much more manageable. It's one of those specialized tools that seems expensive until you actually need it - then it's worth every penny. The cutting action is smooth and controlled, giving you professional-looking results without the professional price tag. Definitely a solid addition to any serious DIYer or contractor's toolkit.