Best Keyhole Bit for Router (2026): 5 Picks

Specs compared

Specifications are manufacturer rated, as published on each listing and collected 22 October 2026. “Not stated” means the listing does not give the figure. One listing calls its bit a keyhole bit in the title while the spec table says straight cut; the review follows the title.

Buying guide: best keyhole bit for router

How a keyhole bit cuts

A keyhole bit plunges into the work, then moves sideways to cut a slot with a wide round pocket at the end and a narrow mouth along its length. The screw head drops into the pocket and slides behind the narrow section, so the workpiece hangs flush with no visible fastener. The Whiteside listing describes it exactly this way: a vertical slot with a wider top for the screw head and a narrower section to hold the screw. Cut the slot in a climb direction the listing does not name; follow your router’s manual for feed direction.

Blade diameter and slot size

Blade diameter sets the pocket size. The Freud cuts a 25/64 in pocket with a 3/16 in small diameter, and the Whiteside a 3/8 in large diameter with a 3/16 in small diameter. The BAYTORY and Totowood sets span six diameters, 1/4, 5/16, 3/8, 9/16, 1/2 and 5/8 in, which covers small picture-frame screws up to hex bolts for T-track fixtures. The Flytuo set covers three, 5/16, 3/8 and 1/2 in. Match the pocket to the screw head you plan to hang the piece on.

Shank size and router fit

All five run 1/4 in shanks for a standard 1/4 in router collet. The Freud listing also names CNC and other automatic routers as well as hand-held and table-mounted portable routers, which is the widest stated compatibility here. The BAYTORY and Totowood listings warn their bits are for portable and desktop woodworking engraving machines and cannot be used in an electric drill or drilling machine. Keyhole bits cut sideways, which a drill press is not built for.

Carbide and cut quality

Every pick here is carbide. The Freud lists 2 cutters, a 7/16 in carbide height and a Perma-SHIELD coating, with a kickback reducing design and computer-balanced construction for smooth cuts. The Whiteside is carbide-tipped with 2 flutes. The BAYTORY uses C2 micro-grain tungsten carbide blades on a hardened steel body, the Totowood C2 carbide inserts, and the Flytuo heat-treated tungsten carbide blades it says can be re-sharpened. More cutters and finer carbide generally mean cleaner slot walls and less sanding.

Single bits versus sets

A single bit like the Freud or Whiteside makes sense when you hang one size of fastener over and over, such as a production run of signs. A set earns its place when every project hangs on something different: the six-piece sets cover everything from 1/4 in to 5/8 in pockets, and the Flytuo three-piece covers the middle three sizes. Sets cost more per bit in absolute terms but less per size covered.

Setup notes from the listings

Two listings give setup guidance worth following. The Flytuo listing says to clamp the shaft correctly and start the router at 10,000 RPM to prevent bending, and to take protective measures during woodworking. The BAYTORY and Totowood listings warn their bits are not for drills, which bears repeating: sideways cutting loads belong in a router collet, not a chuck. Set the plunge depth so the full blade diameter clears the bottom of the slot, and make the sideways pass in one smooth motion for the cleanest mouth.

Project Match

• Hanging plaques, shelves, picture frames and mirrors with hidden fasteners: Freud 70-104, Whiteside 3050, BAYTORY and Totowood sets all name these uses.
• T-slots and keyhole slots for hex bolts and shop fixtures: BAYTORY, Totowood and Flytuo sets state T-track slotting use.
• CNC router work: the Freud listing states use on CNC and other automatic routers; the other listings name hand-held or portable routers.
• Acrylic and laminate panels: the Flytuo listing names acrylic and laminate among its materials and warns against cutting metal; the other listings name wood, plywood, MDF and composites.

How the scores add up

Each bit or set is scored on performance, build, value, safety and warranty, using only what the listing publishes. Four listings state a kickback-resistant or anti-recoil design, which counts for safety; the Whiteside states none. Only the Freud states a warranty term, a limited lifetime warranty.

Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score.

FAQ: lasers and CNC

How does a keyhole router bit work?

You plunge the bit into the workpiece, then move the router sideways to cut a slot. The bit’s wide end cuts a round pocket that the screw head drops into, and the narrow shank of the bit cuts the mouth the screw slides along. The result hangs flush with the fastener hidden behind the work.

Can I use a keyhole bit in a drill?

No. The BAYTORY and Totowood listings warn their bits are for routers and woodworking engraving machines and cannot be used in an electric drill or drilling machine. Keyhole bits cut sideways, and a drill is built for vertical cutting only.

What size keyhole bit do I need?

Match the pocket to your screw head. The Freud cuts a 25/64 in pocket and the Whiteside a 3/8 in pocket, both with a 3/16 in small diameter. If you hang many fastener sizes, the BAYTORY and Totowood sets span 1/4 to 5/8 in and the Flytuo set spans 5/16 to 1/2 in.

Can I use these bits on a CNC router?

The Freud listing states use on CNC and other automatic routers as well as hand-held and table-mounted portable routers. The other listings describe hand-held or portable router use. Program the plunge and the sideways slot move as the bit requires, and clamp the work.

What materials can keyhole bits cut?

The listings name solid wood, plywood, MDF, particleboard and composites across the group. The Flytuo adds laminate and acrylic and warns against cutting metal and non-wood materials. None of the listings states a warranty against misuse, so keep to the stated materials.

Do any of these bits have a warranty?

One does. The Freud listing states coverage by Freud’s limited lifetime warranty. The BAYTORY, Totowood, Flytuo and Whiteside listings state no warranty term, so warranty scores zero for those four.

Related: the best CNC router bits for the rest of the tool wall, CNC router bits for hardwood when the project is solid stock, and the 1/4 vs 1/2 in shank router bits guide. Browse the CNC tooling section and the CNC routers they spin in.