PROMASTERTOOL™ Bullnose Router Bits - 1/2" Shank

Give your project a smooth, rounded edge

Shape a continuous half-round profile along shelves, window sills, stair nosing and other wooden edges with PROMASTERTOOL™ Bullnose Router Bits. The concave cutting profile rounds the upper and lower sides of the edge together, helping you produce a consistent curved outline.

Choose from five profile sizes for delicate trim or a more prominent rounded edge. All sizes use a 1/2″ shank and feature a tip-mounted guide bearing.

Understand the size before choosing

The selectable 1/4″, 3/8″, 1/2″, 5/8″ and 3/4″ sizes refer to the diameter of the rounded profile—its height from the top to the bottom of the semicircle. They are not the outside diameter of the complete cutter. The profile radius is half that size.

For a fully rounded edge, match the profile height to the stock thickness. With thicker material, the profile can leave flat shoulders above and below the rounded section, depending on the setup.

Bearing-guided edge shaping

The guide bearing helps establish the router-table fence position and can follow a suitable template for curved work. Keep the bearing in contact with a continuous guide surface and support the workpiece throughout the cut.

Suitable for routing solid wood, MDF, plywood and particle board. Surface finish depends on the material, grain direction, cutting allowance and setup; make a test cut before working on the finished part.

Dimensions for your setup

Shank diameter: 1/2″ (12.7 mm) on every size. Cutting height includes the full cutting section and is different from the rounded profile height. Inch dimensions follow the individual product diagrams; metric values are rounded conversions.

Prepare for a consistent finish

• Select the profile that suits your stock and desired edge.
• Use a router with a suitable 1/2″ collet and follow its installation, speed and feed instructions.
• Set the height and fence on scrap, then check that the rounded profile is positioned correctly.
• Remove material in controlled cuts appropriate to the setup; do not assume every edge should be completed in one heavy pass.

Choose a single size or the complete set

The 5 Piece Set contains one of each profile size: 1/4″, 3/8″, 1/2″, 5/8″ and 3/4″. Individual options contain one bit in the selected size. Project photos illustrate typical uses; wood, templates and a router are not included.