Designed for aggressive performance on tough EDGE grinding applications, Tiger Paw™ flap discs feature grain and poly-cotton backing that promote operational efficiency and service life. Multiple layers of coated abrasive material expose sharp, fresh grains as they wear, and 100% premium zirconium grain prevents premature grain shedding on aggressive applications. Phenolic back Tiger Paw is available in 4 � and 7 in. sizes with or without 5/8 in.-11 nut.