Infinity Tools Shape-Up Radius Backcutter Shaper Cutter, 3/4" Bore

It rabbets and radiuses the back of a raised panel to reduce the edge to a consistent tongue thickness, so the panel fits cleanly into the groove of a rail-and-stile frame. See the full Shape-Up shaper cutter system.

It's designed for 3/4"-thick door panels and, when used with a raised panel cutter and rub collar, leaves a 1/4"-thick tongue for a proper fit in standard frame grooves.

It has a 3/4" bore, which fits 3/4" shaper spindles. Browse more shaper cutters and accessories.

Yes. The backcutter is designed to be used in conjunction with our Shape-Up raised panel shaper cutters and a rub collar; together they form the complete raised-panel profile.

The cutter is 3-1/2" in diameter with a 1/2" cutter height and a 1/8" cutter radius, producing a gentle radius on the back of the panel.

Rabbeting the back creates a consistent tongue thickness so the panel seats properly in the frame groove and the front profile stands proud the right amount, giving a balanced, professional look.

Yes, it's part of the Shape-Up carbide shaper cutter line, which uses long-lasting carbide cutting edges that can be professionally re-sharpened.

A rub collar (bearing) controls the depth of cut on a shaper by riding against the workpiece. You'll use one with the backcutter and raised-panel cutter to set the profile. See shaper cutters and accessories.

This is a shaper cutter with a 3/4" bore and is intended for use on a spindle shaper. For router-table panel work, use dedicated raised-panel router bits from our router bits.

Frame-and-panel cabinet doors, raised-panel wainscoting, and any project with floating raised panels that need a consistent, well-fitting tongue. See our door-making tools.