SODIAL(R) 6" Stone Granite Diamond Grinding Wheel Metal Blade Disc 400 Grit Product Name : Diamond Grinding Disc;Material : Metal, Diamond Particles Color : Silver Tone;Outside Diameter : 152mm / 6" Arbor Hole Diameter : 12.7mm / 1/2";Disc Thickness : 1mm / 0.039" Grit : 400;Weight : 146g