Mũi khoan xoắn đơn bằng thép cứng dài 9 inch

The single-flute design really does clear chips faster than the two-flute bits I used before, and the 9-inch length gives me plenty of reach on deeper routing passes. Hardened steel still feels sharp after a few weeks of weekend projects.

I've put these through some heavy routing jobs and they're still holding an edge nicely, the hardened steel feels solid in the collet. Chip evacuation is quick enough that I'm not constantly stopping to clear the cut, which makes a real difference on longer passes.

The single-flute design really does clear chips fast—I ran it through some dense maple and didn’t have to stop and clean the cut once. The 9-inch length gives plenty of reach for deeper passes, and the steel held its edge the whole session.