Based on my experience with these Industrial and Scientific router bits, Amana Carbide Spiral Plunge Up Cut Cutting Tools and Router Bits are an excellent addition to any woodworker’s toolbox. These bits easily plunge through any type of wood without any tear-out or splinters, while delivering a smooth and clean cut every time. The spiral design helps with dust extraction, keeping your work area cleaner. The only DOWNSIDE is that they are a bit pricier than other router bits on the market but the quality is well worth the investment. Overall, highly recommend!