The QEP Black Widow Premier Diamond Blade Series is designed for quick cutting of tile including porcelain, ceramic, granite and marble, without wobble or chipping. These blades feature a reinforced steel core hub to significantly reduce flex and vibration. The unique diamond-shaped laser cutouts around the perimeter of the Black Widow keep the blade cooler for superior performance and a longer life. For dry cutting. A great choice for professionals and DIYers alike.