CMT Roundover Bits with Insert Knives - 57/64" Diameter, 5/64" Radius, 1/4" Shank by CMT are precision-engineered router bits designed for rounding over and finish-edging work on laminates, hardwood, softwood, and more. Featuring two replaceable carbide insert knives secured by special Torx screws, these right-hand rotation bits deliver clean, consistent profiles on edge work where accuracy and repeatability matter. The built-in ball bearing guide follows the workpiece edge precisely, making these bits a reliable choice for decorative edging and professional laminate trimming applications.

Key Features

• Two replaceable insert knives secured by Torx screws - knives can be swapped out when worn rather than replacing the entire bit, reducing long-term tooling cost and downtime.
• Blades profiled on 2 sides (HW carbide material) - each knife has two usable cutting edges, so you can rotate to a fresh edge when one side dulls, extending the working life of every knife insert.
• Ball bearing guide included - the bearing follows the edge of your workpiece automatically, allowing precise, consistent roundover profiles without the need for a fence or secondary guide setup.
• 5/64" radius profile - produces a subtle, refined roundover that softens sharp edges cleanly on laminates and wood-based panels, ideal for furniture edging and cabinetry detail work.
• 1/4" shank diameter - compatible with a wide range of compact hand routers and laminate trimmers equipped with a 1/4" collet, giving you flexible tool compatibility.
• Right-hand rotation - matches the standard rotation direction of virtually all handheld routers and router tables, ensuring safe, predictable feed direction.
• 2-tooth (2-flute) configuration - balances cut quality with efficient chip clearance, helping maintain smooth surface finishes on laminate and composite panel materials.

Why This Product

• The replaceable insert knife design means you are investing in a long-lasting tool body rather than a disposable bit - when cutting performance drops, you replace only the knife insert, not the entire router bit assembly.
• Profiled on 2 sides, each insert knife offers more than one usable cutting edge, so productivity stays high even as individual edges wear during heavy laminate or hardwood edging sessions.
• The integrated ball bearing guide takes the guesswork out of edge-following, delivering a uniform 5/64" roundover profile pass after pass without repositioning or manual fence adjustments.
• With a compact 1/4" shank and a total length of 2 17/64", this bit is well-suited for handheld routing tasks and laminate trim work where a smaller, maneuverable tool is preferred over a large router table setup.

Specifications

• Manufacturer Part Number: 661.021.41
• Brand: CMT Orange Tools
• Diameter: 1 1/16"
• Small Diameter: 12.7mm
• Cutting Height: 49/64"
• Total Length: 2 17/64"
• Radius: 5/64"
• Shank Diameter: 1/4"
• Number of Teeth: 2
• Material: HW (Carbide)
• Rotation: Right-Hand

Approved Applications

• Roundover edge profiling on laminates
• Edge finishing on hardwood and softwood panels
• Decorative edgework on furniture components
• Precision trimming and edging on chipboard and composite panels