CMT Contractor Round Nose Bit - 3/8" Diameter, 3/16" Radius, 1/4" Shank is a two-flute carbide-tipped routing bit engineered for professional sign makers and cabinet makers who demand clean, consistent semi-circular grooves and decorative profiles. With a 3/8" cutting diameter and a 3/16" radius, this round nose (core box) bit excels at fluting, veining, and decorative cove routing in solid wood, sheet goods, and wood-based composites. The right-hand rotation and 1/4" shank make it compatible with a wide range of handheld routers and router tables used in both shop and production environments.

Key Features

• Two Carbide-Tipped Cutting Edges - dual cutting edges in hard carbide material deliver smooth, clean cuts through solid hardwood, softwood, plywood, MDF, and wood composites, reducing tearout and sanding time.
• 3/16" Round Nose Radius (3/8" Diameter) - produces a precise semi-circular cove profile ideal for decorative door panels, drawer fronts, sign lettering, and creative woodworking grooves.
• 1/4" Shank - fits a broad range of compact and full-size routers, making this bit accessible for both handheld routing and router table setups without requiring a specialized collet.
• Right-Hand Rotation - standard RH rotation ensures compatibility with the vast majority of router machines on the market, so you can drop it in and get to work without configuration adjustments.
• 1 9/16" Total Length - compact overall length provides good stability in the collet and reduces bit deflection, contributing to accurate, repeatable cuts across a project.
• HW (Hard Metal Carbide) Material - industrial-grade carbide construction resists wear during extended routing sessions, maintaining edge quality longer than standard high-speed steel alternatives.

Why This Product

• Designed specifically for sign and cabinet makers, this bit produces the smooth, consistent semi-circular grooves needed for decorative doors, drawer fronts, and professional sign lettering - making it a purpose-built tool rather than a general-purpose compromise.
• The 1/4" shank size makes this bit accessible for use in compact trim routers and full-size routers alike, giving woodworkers flexibility across different machines in the shop without swapping collet sets.
• With two carbide-tipped cutting edges and a hard metal carbide composition, this bit holds its edge through repeated passes in hardwood and sheet materials, reducing downtime from bit changes during longer production runs.
• The 3/16" radius profile strikes a practical balance - large enough to create a visually defined decorative groove but compact enough for fine detail work on smaller panels, signs, and furniture components.

Specifications

• Manufacturer Part Number: 81411
• Brand: CMT Orange Tools
• Diameter: 3/8"
• Cutting Height: 3/8"
• Radius: 3/16"
• Shank: 1/4"
• Total Length: 1 9/16"
• Number of Teeth: 2
• Rotation: Right-Hand (RH)
• Blade Material: HW (Hard Metal Carbide-Tipped)

Approved Applications

• Routing semi-circular coves and decorative grooves
• Fluting and veining in solid wood panels
• Decorative door and drawer front profiling
• Professional sign making and lettering
• Creative woodworking detail work on panels and furniture