Includes 5 high-performance 4.1/2 (115mm) abrasive discs with semi-flex fiberglass backing - perfect for continuous grinding jobs without frequent disc changes Made with zirconia alumina grains (confirm if accurate) that cut 30% faster than standard aluminum oxide discs on granite, marble, natural stone & glass surfaces. Fiberglass mesh construction absorbs shocks and minimizes hand fatigue during extended use on angle grinders Laser-cut ventilation holes prevent overheating and reduce workpiece burn marks for cleaner finishes on delicate materials. Fits all 4.1/2 angle grinders with 7/8 arbor (includes 5/8 -11 thread adapter if applicable). Ideal for masons, contractors and DIY enthusiasts UPC 682601963856 Model ZECWG Brand Name SIGNI Grit Number 36 Manufacturer SIGNI Item Thickness 5 Millimeters Item Dimensions 4.72 x 4.72 x 0.1 inches Item Dimensions L x W 4.72 L x 4.72 W Maximum Rotational Speed 4500 RPM