Use the Metabo HPT 7 1/4 inch Fiber Cement Blade to cut fiber cement board and Hardiboard surfaces cleanly and precisely. The circular saw blade has a carbide base that is meant for cutting through abrasive and brittle material. The Hitachi 7-1/4 inch fiber cement blade has four flat-top cutting teeth on its 7-1/4 inch diameter material, each tipped in polycrystalline diamond to maintain sharpness and extend its cutting life. The tooth design reduces the amount of dust and chips thrown off during cuts, with an advanced kerf, gullet and bevel configuration. The blade is machine-engineered and laser-cut to exacting dimensions,specified to handle up to 8,300-rpm circular-saw rotation for both cross-cutting and ripping. The Metabo HPT laser-cut fiber cement blade has expansion slots to reduce blade warp.