QEP 6-4008BW 4-Inch Black Widow Micro-Segmented Rim Diamond Blade, 5/8-7/8-Inch Arbor, Wet/Dry Cutting, 15000 Maximum RPM Premium-grade, thin-rim diamond blade for fast wet cutting of porcelain, ceramic, granite and marble tile Ideal for high speed cutting of hard masonry tile Unique diamond-shaped laser cutouts prevent blade wobble and keeps blade cooler for a longer life 7mm rim height for a longer life and for increased cutting contact with the blade