A studio shot of the three mortising router bits included in the Freud 89-670 set, featuring red Perma-SHIELD coating and carbide-tipped edges in 7/32 inch, 15/32 inch, and 23/32 inch diameters.
Technical profile diagrams demonstrating the precise grooves and dadoes created by the 16-094, 16-109, and 16-116 bits to perfectly match the true thickness of undersized plywood panels.
A materials compatibility graphic showing that the Freud 89-670 bit set is ideal for routing clean channels in plywood, hardwoods, softwoods, and MDF.
A tool compatibility chart indicating that the Freud undersized plywood bits can be used with a hand-held router, a table-mounted router, or a CNC machine.
A studio shot of the three mortising router bits included in the Freud 89-670 set, featuring red Perma-SHIELD coating and carbide-tipped edges in 7/32 inch, 15/32 inch, and 23/32 inch diameters.
An action photo of a Freud red mortising bit routing a perfectly fitted groove into a thick hardwood board on a router table.
A studio shot of the three mortising router bits included in the Freud 89-670 set, featuring red Perma-SHIELD coating and carbide-tipped edges in 7/32 inch, 15/32 inch, and 23/32 inch diameters.
Technical profile diagrams demonstrating the precise grooves and dadoes created by the 16-094, 16-109, and 16-116 bits to perfectly match the true thickness of undersized plywood panels.
A materials compatibility graphic showing that the Freud 89-670 bit set is ideal for routing clean channels in plywood, hardwoods, softwoods, and MDF.
A tool compatibility chart indicating that the Freud undersized plywood bits can be used with a hand-held router, a table-mounted router, or a CNC machine.
A studio shot of the three mortising router bits included in the Freud 89-670 set, featuring red Perma-SHIELD coating and carbide-tipped edges in 7/32 inch, 15/32 inch, and 23/32 inch diameters.
An action photo of a Freud red mortising bit routing a perfectly fitted groove into a thick hardwood board on a router table.
Freud

Freud Router Bit Set 89-670 3 Piece Undersized Plywood (1/2 Inch Shank 7/32 15/32 23/32 Inch Diameter Precise Dadoes and Groove Joinery)

In stock
SKU: 89-670
$55.39 USD

Description

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The Freud 89-670 3-Piece Undersized Plywood Router Bit Set is engineered to produce precision-fit grooves and dadoes by compensating for the actual undersized thickness of modern plywood panels. Featuring carbide-tipped mortising bits sized at 7/32-inch, 15/32-inch, and 23/32-inch, this set eliminates loose joints and the need for shim materials in cabinetry and shelving assembly. Each bit utilizes a robust 1/2-inch shank for stability and is finished with a proprietary non-stick coating to resist pitch buildup and thermal degradation during intensive routing sessions.

Best Used For:

  • Cabinetry and Furniture Construction: Creates tight, gap-free joints for shelving and drawer assemblies using modern, undersized plywood thicknesses.
  • Dado and Groove Joinery: Produces accurate slots for bookshelf dividers, cabinet backs, and frame construction without requiring multiple passes.
  • Custom Woodworking Projects: Facilitates precision joinery in hardwood, softwood, and composite substrates for high-end furniture fabrication.

Key Performance & Safety Features

  • Precision Plywood Sizing: Specialized cutting diameters ensure a flush, professional fit with standard modern plywood that deviates from nominal dimensions.
  • Perma-SHIELD Non-Stick Coating: Proprietary thermal barrier prevents resin gumming and protects against corrosion, significantly extending edge lifespan.
  • TiCo High-Density Carbide: Industrial-grade carbide tips maintain razor-sharp profiles for consistent material removal in dense hardwoods and composites.
  • Stability-Focused Shank: Durable 1/2-inch shank diameter minimizes vibration and lateral deflection for superior finish accuracy on table-mounted routers.
  • Premium Shadowbox Storage: Includes a high-durability wooden case designed for secure organization and protection of precision tooling during transit.

What's Included

  • (1) 7/32 Inch Diameter Mortising Bit (#16-094)
  • (1) 15/32 Inch Diameter Mortising Bit (#16-109)
  • (1) 23/32 Inch Diameter Mortising Bit (#16-116)
  • (1) Premium Wooden Shadowbox Storage Case

Technical Specifications

Brand Freud
Model Number 89-670
Bit Type Plywood Mortising
Shank Diameter 1/2 Inch
Bit Material Carbide Tipped
Piece Count 3 Bits
Diameters 7/32, 15/32, 23/32 Inch
Assembled Weight 0.8 Pounds
Country of Origin Italy
Warranty Lifetime Manufacturer's Defect

Pro-Tip: To ensure the longest tool life, perform multiple shallow passes when cutting deep dadoes rather than attempting a single full-depth cut; this practice significantly reduces side-load stress on the carbide tips and ensures a burn-free, smooth bottom surface.