The cutting edges of these bits have a shallow angle to carve foam quickly and accurately. With a square cut style, they create slots, pockets, and edges. These bits are good for plunge cutting, letting you cut directly into the workpiece from above. They do not have a pilot, so guide your router along a straight edge when hand routing to make accurate cuts.

Use carbide bits for longer tool life and faster cutting speeds than high-speed steel. Their extreme hardness means they are brittle, so a highly rigid setup, such as a CNC machine, is necessary to prevent the bit from breaking. Ceramic-coated carbide bits have a coating that increases the hardness of the bits and protects them from high heat, making them last about 2.5 times longer than uncoated bits.

Bits with spiral flutes leave a smoother finish than V-flute bits and make plunge cuts more easily. Bits with upward chip removal lift chips up for applications that require a smooth finish on the bottom edge of the cut. Securely clamp the workpiece before routing to prevent lifting. Bits with downward chip removal push chips down for applications that require a smooth finish on the cut's top edge.