Teeth are set from side to side in a wavy pattern for cutting metal sheets and thin-walled pipe. These bimetal blades have a carbon steel body with high-speed steel teeth that last up to four times longer than carbon steel teeth. They're flexible for making straight and curved cuts. Cut them to length and use a band saw welder to join the ends. Tooth size and number per inch are constant throughout the blade. Choose blades with more teeth per inch for a smooth finish; choose blades with fewer teeth per inch for fast, rough cutting.