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Na940 Norton Flap Disc.

Flat 5/8-11 40 grit
Norton 20X High Performance Zirconia Type 27 flap disc are suitable for blending and smooth finishing on flat surfaces on a variety of metals. Designed for right-angle, handheld, grinding machines for heavy stock removal and surface blending. Zirconia is a self-sharpening abrasive that allows for a faster cut rate and longer life than Aluminum Oxide, due to its ability to fracture and re-fracture, creating new cutting edges. Used for fast stock removal on both woods and metals.