The CMT 880.542.11 Solid Surface Rounding Over Bowl Bit is a specialized ogee-profile router bit designed to roundover and trim countertop edges after an undermount bowl is mounted. Built by CMT for use on hand-held portable routers, this 2 1/8 in. diameter bit handles the finishing work that solid surface countertop fabrication demands - delivering smooth, consistent edge profiles on Corian, Wilsonart, Gibraltar, and similar solid surface materials. With a 1/2 in. shank for secure tool holding and a Delrin non-marring bearing to protect finished surfaces, it is an essential tool for professional countertop installers and fabricators working with undermount sink and bowl installations.

Key Features

• Ogee profile rounding over bowl bit - rounds over and trims countertop edges after the bowl is mounted, producing clean, finished profiles on solid surface countertops without secondary sanding operations.
• Variable radius range of 1/4 in. to 1/2 in. - offers flexibility across different edge profile requirements, allowing fabricators to match a range of design specifications with a single bit.
• Delrin non-marring bearing - the bearing rides against finished surfaces without scratching or marking them, protecting the completed edge during profiling passes.
• 2-flute HW (tungsten carbide) cutting edge - hard carbide material maintains sharpness during repetitive solid surface cuts, extending tool life compared to standard steel tooling.
• 2 1/8 in. cutting diameter with 15 deg. approach angle - the geometry is calibrated for solid surface bowl cutouts, producing accurate, repeatable results on countertop installations.
• Compatible with CMT 8/980.551.11 and 8/966.501.11 bevel cutters - enables a flush cut-out between the countertop and an installed undermount bowl when used alongside those CMT bevel cutter models.
• Right-hand rotation - matches standard portable router spindle direction, making setup straightforward for fabricators using conventional hand-held routers.
• 1/2 in. shank diameter - the large-diameter shank reduces vibration and deflection during cutting, contributing to a smoother, more accurate edge profile.

Why This Product

• Designed specifically for solid surface countertop bowl installations, this bit addresses the precise edge-trimming step that general-purpose roundover bits are not optimized for - making it the purpose-built choice for undermount bowl work.
• The Delrin non-marring bearing means fabricators can profile finished countertop edges without introducing scratches or marks, eliminating rework on expensive solid surface material.
• Compatibility with CMT bevel cutters (models 8/980.551.11 and 8/966.501.11) means this bit integrates into a complete CMT system for flush cut-outs, reducing the need to source tools from multiple manufacturers.
• A maximum cutting thickness of 3/4 in. and a 1 in. cutting height accommodate standard solid surface countertop stock dimensions, so fabricators can work confidently without worrying about material compatibility.

Specifications

• Manufacturer Part Number: 880.542.11
• Brand: CMT Orange Tools
• Diameter: 2 1/8 in.
• Radius: 1/2 in.
• Radius Range: 1/4 in. - 1/2 in.
• Shank: 1/2 in.
• Cutting Height: 1 in.
• Total Length: 3 1/16 in.
• Maximum Thickness: 3/4 in.
• Angle: 15 deg.
• Number of Teeth: 2
• Material: HW (Tungsten Carbide)
• Rotation: Right-hand (RH)

Approved Applications

• Rounding over and trimming countertop edges after undermount bowl installation
• Ogee edge profiling on solid surface countertop materials
• Flush cut-out finishing between countertop and installed undermount bowl (used with compatible CMT bevel cutters)
• Edge finishing on Corian, Wilsonart, Gibraltar, and comparable solid surface materials