Standard Replacement Knife for Insert-Pro Extended Tenon Head

Standard Replacement Knife for Insert-Pro Extended Tenon Head - View 3

$29.13 ~~$39.9~~ In stock

Designed to fit on Infinity Tools Insert-Pro Extended Tenon 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. These profiles allow you to cut mating cope ends when using our Interior / Exterior Door Making System.

Please note: Two (2) replaceable Insert-Pro knives are required per head, each sold individually.

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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 (4.8 / 5 · 5 reviews)

Abigail X. ★★★★★ Oct 21, 2026

Installed these on my shaper head and the fit is spot on—no fiddling to get them seated right. The cutting edge held up through a full day of hardwood without any chipping, which is more than I can say for my old brazed set.

Sebastian I. ★★★★★ Oct 20, 2026

C4 carbide is noticeably tougher than standard blades—I've been running these on my tenon work and they're still sharp after a full day of cutting. The fit on the Insert-Pro head was perfect with no wobble.

Aurora J. ★★★★★ Oct 19, 2026

Installed these on my shaper head and the cut quality was immediately cleaner than my old brazed carbide. C4 sub-micron grade is no joke, these should last a long time through production runs.