The Festool HW R2-OFK 500 Z1 roundover cutter is a small-profile router bit made for clean edge easing on solid wood and plastic edging. This is a roundover cutter designed for rounding and finishing small edges with better control and a cleaner finish. Model number 578377. If you are using an OFK 500 edge router and want a subtle finished edge instead of a sharp corner, this is the cutter for that job.
What makes this bit useful is its size and purpose. With a 27 mm diameter and a 2 mm radius, it is aimed at fine edge work, not heavy profile shaping. That matters when you are finishing trim parts, cabinetry details, or small solid wood components where a large roundover would look out of place. It lets you break the edge cleanly and leave a more finished feel without changing the look of the part too much.
The single-edged design is not just a spec on paper. Festool calls out lower heat buildup as a real advantage, especially when routing across the grain. In practical terms, that means fewer scorch marks and less sanding afterward. If you have ever had a small edge profile get dark or fuzzy right at the end of a pass, that is exactly the kind of issue this design is trying to reduce.
Festool also built this roundover cutter around accurate running and a clean finish. The hollow core cutter fits directly onto the spindle, which helps improve run-out accuracy. That is important on detail work because a cleaner-running bit leaves a more even profile and makes it easier to get repeatable results from piece to piece.
Another smart detail is the low installation height created by the flush ball bearing mount. On the bench, that means you can work closer to rebates and stacked material where bulkier bit layouts can get awkward. Festool also notes that the radius transitions into a 5 degree run-out on the router blade to help protect the surface, which is a meaningful detail when you are trying to keep finished faces clean.
This router bit is best suited for woodworkers, finish carpenters, cabinet installers, and serious DIY users doing controlled edge finishing rather than aggressive stock removal. If your work involves easing exposed edges on solid wood parts or cleaning up plastic edge material with a compact edge router, the Festool HW R2-OFK 500 Z1 roundover cutter is a purpose-built option that makes sense.
