Flap Disc, High Density "Jumbo" Blue Zirconia, 80 Grit Type 29, Depressed Center, 4-1/2" with 5/8-11 Arbor ZA80, for right angle grinders. Cuts fast and outlast sanding discs 10-to-1. Great flexibility. Ideal for rough or fine finishing. High density discs are ideal for the extra tough jobs. Long lasting, cooler running Jumbo style. Wheel Size: 4-1/2" Arbor: 5/8"-11 Grit: 80 Spec: ZA80 Max RPM: 13,500 Tool Type: Right Angle Grinder