Forney 71931 Flap Disc, Type 29 Blue Zirconia with 5/8-Inch-11 Threaded Arbor, 60-Grit, 4-1/2-Inch 4.5" Flap disc - type 29 - 60 grit - depressed center - 5/8 11" Arbor Easy to use The product is manufactured in China Blue zirconia flap discs for right angle grinders Cuts fast and outlast sanding discs 10 to 1 for long life Multiple layers of zirconia cloth flaps constantly exposing new extra sharp grinding points Great flexibility for difficult work Ideal for rough or fine finishing