Ultra-Shear Variable Helix Mortise & Tenon Router Bits are engineered for woodworkers who demand smooth plunging, chatter-free cuts, and precise joinery results.

Designed specifically for mortise and tenon joinery, these spiral upcut bits outperform standard straight and single-helix cutters—especially in deep mortises and long tenons. The variable helix geometry begins with a shallow angle at the tip for controlled entry and increases toward the shank to evacuate chips efficiently, reducing vibration and improving surface finish.

Ideal for use with Shaper Origin joinery machines, these bits also excel in plunge router and fence-guided setups. Clean entry points, satin-smooth sidewalls, and consistent dimensional accuracy make them a go-to cutter for furniture makers and serious woodworkers.

Manufactured from solid micro-grain carbide and precision-ground in Strongsville, Ohio, Ultra-Shear Variable Helix Router Bits deliver long tool life and dependable American-made quality.