Studio shot of the three-piece Freud router bit set standing upright, showing the varying cutting diameters designed for 1/4, 1/2, and 3/4 inch plywood, all with red Perma-SHIELD coating.
Studio shot of the three-piece Freud router bit set standing upright, showing the varying cutting diameters designed for 1/4, 1/2, and 3/4 inch plywood, all with red Perma-SHIELD coating.
Technical profile diagram displaying four cross-section examples of square U-shaped dado grooves cut into wood blocks, illustrating the flat-bottom geometry created by the router bits.
Informational graphic titled Materials, showing samples of Plywood, Hardwoods, Softwoods, and MDF to indicate the router bits' compatibility with various wood types.
Compatibility graphic labeled Tools, featuring icons representing a hand router, table router, CNC machine, and palm router to demonstrate supported equipment.
Close-up action shot of a red Freud router bit cutting a clean, precise dado groove into a light wood board during a router table operation.
Freud, Precisely the Best promotional video
Studio shot of the three-piece Freud router bit set standing upright, showing the varying cutting diameters designed for 1/4, 1/2, and 3/4 inch plywood, all with red Perma-SHIELD coating.
Studio shot of the three-piece Freud router bit set standing upright, showing the varying cutting diameters designed for 1/4, 1/2, and 3/4 inch plywood, all with red Perma-SHIELD coating.
Technical profile diagram displaying four cross-section examples of square U-shaped dado grooves cut into wood blocks, illustrating the flat-bottom geometry created by the router bits.
Informational graphic titled Materials, showing samples of Plywood, Hardwoods, Softwoods, and MDF to indicate the router bits' compatibility with various wood types.
Compatibility graphic labeled Tools, featuring icons representing a hand router, table router, CNC machine, and palm router to demonstrate supported equipment.
Close-up action shot of a red Freud router bit cutting a clean, precise dado groove into a light wood board during a router table operation.
Freud, Precisely the Best promotional video
Freud

Freud 89-660 3 Piece Undersized Plywood Router Bit Set 1/4 Inch Shank Carbide Tipped Dado Groove Cutter For Cabinet Making

Only 1 left
SKU: 89-660
$47.95 USD

Description

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Achieve Perfect Joinery with the Freud 3-Piece Undersized Plywood Router Bit Set

Eliminate the frustration of loose-fitting joints and sloppy dadoes with the Freud (Diablo) 89-660 Undersized Plywood Bit Set. Modern plywood panels often measure thinner than their nominal thickness—a "3/4 inch" sheet is rarely a full 3/4 inch. Standard router bits leave gaps that weaken joints and look unprofessional. This specialized 3-piece set is precision-engineered to match the actual thickness of today's 1/4", 1/2", and 3/4" plywood, ensuring snug, rattle-free grooves and dadoes every time. Whether you are building bookshelves, cabinets, or drawers, these bits provide the tight, glue-ready fit essential for high-quality craftsmanship.

Manufactured in Italy, these bits feature Freud's industry-leading TiCo™ Hi-Density Carbide, offering a sharper edge and superior longevity compared to standard bits. Each bit is finished with the signature Perma-SHIELD® coating, a non-stick formulation that reduces friction, heat buildup, and resin accumulation, preventing burning even in dense plywoods and composites. Compatible with all hand-held and table-mounted routers accepting a 1/4-inch shank, this set comes organized in a durable wooden shadowbox case, keeping your essential joinery tools protected and ready for your next project.

Key Features

  • Precise Sizing: Bits are slightly undersized (7/32", 15/32", 23/32") to match the true thickness of nominal plywood.
  • Flawless Joinery: Creates perfectly fitted grooves and dadoes for strong, gap-free shelving and cabinet joints.
  • Industrial Carbide: Features TiCo™ Hi-Density Carbide for maximum cutting life and a flawless finish.
  • Perma-SHIELD® Coating: Protects against heat, rust, and pitch build-up for smoother operation.
  • Versatile Use: Safe for use in hardwood, softwood, plywood, and composites on both hand-held and table routers.
  • Shear Angle Design: Engineered to slice through wood fibers cleanly, minimizing tear-out on delicate veneers.
  • Protective Storage: Includes a custom wooden shadowbox case for safe storage and easy identification.

What's Included

1 x 7/32" Diameter Straight Bit (Fits 1/4" Plywood)
1 x 15/32" Diameter Straight Bit (Fits 1/2" Plywood)
1 x 23/32" Diameter Straight Bit (Fits 3/4" Plywood)
1 x Wooden Storage Case

Specifications

Manufacturer Model 89-660
Shank Diameter 1/4 in.
Bit 1 Diameter 7/32 in. (for 1/4" ply)
Bit 2 Diameter 15/32 in. (for 1/2" ply)
Bit 3 Diameter 23/32 in. (for 3/4" ply)
Bit Material TiCo™ Hi-Density Carbide
Number of Pieces 3
Coating Perma-SHIELD® (Red)
Country of Origin Italy
Application Plywood Dadoes & Grooves
Warranty Lifetime Manufacturer's

Pro-Tip: Plywood thickness can vary slightly between manufacturers and batches. Before committing to your final project, always make a test cut in a piece of scrap material from the same sheet. Test the fit of your shelf or panel into this groove; it should be snug enough to hold itself up but not so tight that it requires heavy pounding to seat, which could starve the glue joint.