The QEP® Black Widow Diamond blades are designed for quick cutting of hard tile including porcelain, ceramic, granite and marble, without wobble or chipping. Independent lab test results have proven that Black Widow specialty blades continuously out perform the competition in durability for a longer life and speed of cut, reducing project time. The unique diamond-shaped micro segmented laser cutouts around the perimeter keep the blade cooler for superior performance and a longer life.