DEWALT DW8212 4-1/2-Inch by 7/8-Inch Z80 T27 Flap Disc Extended Performance 5pc

From the Manufacturer

• Backing automatically wears down with cloth to allow full use of cloth increasing life by 2x's
• Extended performance flap design lasts 2 times longer than std flap discs
• Premium zirconia cloth prodives agressive grinding action 50 percent faster than std flap discs
• Proprietary design provides removal rate of a grinding wheel with finish of a fiber resin disc
• Max Rpm of 13,300
• Aeronca