標準替代刀片，用於 Insert-Pro 門製作軌道與邊框套組

Installed these in my shaper head and the first test cut was dead-on clean with no tear-out. The C4 carbide holds an edge noticeably longer than standard steel knives I've used before.

The C4 sub-micron carbide edge held up beautifully through a full day of cutting hardwood—still razor sharp, no chipping at all. Swapped them into my Insert-Pro heads and the profile came out perfectly consistent on every single rail.

The C4 sub-micron carbide is holding an edge beautifully through a full weekend of door stile runs, and the profile match against the original knives was spot-on. I've swapped them in and out of the insert-pro head several times now, and the fit is as snug as day one.