Infinity Tools Insert-Pro シャーパーヘッド用 交換用溝切りナイフ

Those four-sided cutters on top and bottom make such a difference—slices the wood surface perfectly clean with zero tear-out. I ran a full sheet of plywood through and every edge came out straight and crisp.

I’ve been running these through some heavy rabbeting jobs and the four-sided cutters on top and bottom really slice the surface clean without any tear-out. Carbide edge held up noticeably longer than my old knives, too.

The two-inch carbide knives are noticeably heavier and sturdier than what I had before, and they slice through oak with zero tear-out. The four-sided cutter design leaves the surface feeling almost glass-smooth, which saves me a ton of sanding time.