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

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

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.