For the serious woodworker or machinist, this Onsrud solid carbide upcut spiral bit is a precision tool. It's got a single O-flute design with a 21-degree helix, made for clean cuts and super easy chip removal. The flute is polished razor-sharp, so it slices through materials like plastic, wood, aluminum, and solid surface composites smoothly. It's an upcut spiral, which means it pulls chips up and out of the cut—great for through cuts and plunging. The bit is 3 inches long overall, with a 1/8 inch (0.1875\) cutting diameter and a 1/4 inch (0.2500\) shank that fits most routers and CNC collets. Since it's solid carbide, it stays sharp longer and can run at higher speeds than HSS bits, but it's also a bit more brittle, so you need a sturdy tool holder. No coating here—just the raw carbide finish. If you need reliability and a clean finish on your projects, this bit's a solid choice.
