Standard Replacement Knife for Insert-Pro Door Making Rail and Stile Set

Standard Replacement Knife for Insert-Pro Door Making Rail and Stile Set - View 3

Standard Replacement Knife for Insert-Pro Door Making Rail and Stile Set - View 4

Standard Replacement Knife for Insert-Pro Door Making Rail and Stile Set - View 5

$25.14 ~~$39.9~~ In stock

Replacement Knives For Interior / Exterior Door Heads

Designed to fit on Infinity Tools Insert-Pro Interior / Exterior Door Making shaper heads, these knives are made from a C4 sub-micron grade of carbide that will last longer and outperform any brazed carbide cutters on the market. You will love the razor-sharp edges and precision-ground mirror finish. The quality of cut they produce is superb and sharpening is very simple. We offer five (5) popular door making profiles to give your Door Making System maximum versatility.

Please note: Two (2) replaceable Insert-Pro knives are required per each head (top & bottom), so a total of four (4) are required per set-up. Each knife is sold individually.

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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.6 / 5 · 5 reviews)

Grace X. ★★★★★ Oct 22, 2026

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.

Lucy ★★★★★ Oct 20, 2026

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.

Alexander Z. ★★★★★ Oct 18, 2026

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.