Endurance blades offer faster cutting and extra long Average Life - hrs for contractors. Carbide teeth made of C3 grade micro ground carbide keeps the cutting edge sharper for longer periods of time. A hardened alloy steel body is used to ensure straight, accurate cuts. Specially engineered heat vents and expansions slots prevent blade distortion and increase blade Average Life - hrs. All these features add up to a good quality blade that contractors can depend on, time and time again.