The Best Choice for Metal Works This flap disc features heavy-duty polyester sanding flaps covered in premium zirconia grains that result in superior grain retention. The disc measures 4.5-inch in diameter with a 7/8-inch arbor size, making it compatible with grinders operatable of up to 13,300 RPM. Cut off wheels for various metal, such as stainless steel, aluminum, ferrous metals, alloys, and other uneven surfaces. Disc that Lasts Forever These Zirconia Jumbo Flap discs are built to take a beating and keep on grinding, deburring, removing rust, sanding down weld splatter, surface finishing, cleaning or simply removing stock this flap disc is in it for the longest period. The coarse grains with fiberglass backing makes the discs work for the longest time and saves you from the hassle of frequently changing the discs. Nothing Grinds better than Zirconia Constructed from the best quality, industrial-grade high-density premium zirconia which provides more grinding material than the regular flap discs. The resin fiber construction with fiberglass backing plate absorbs vibrations. Used for heavy stock removal and often for weld removal, they outperform Resin Fiber Discs due to their increased lifetime and last twice as long as Aluminum Oxide discs. Premium High Density Jumbo Zirconia Flap Disc Grinding Wheel 40 Grit Felt Polishing & Buffing Flap Disc - 5 Pack Aluminum Oxide Flap Disc Type 27 Grit 40 Ceramic Flap Discs T29 (Angled) Grit 36 Jumbo Zirc Flap Disc Grinding Wheel 60 Grit - 20 Pack Add to Cart Add to Cart Buying Options Buying Options Add to Cart Customer Reviews 4.8 out of 5 stars 11 4.1 out of 5 stars 104 4.4 out of 5 stars 21 4.6 out of 5 stars 34 4.3 out of 5 stars 7 Price $16.79$16.79 $26.24$26.24 $19.83$19.83 — no data $50.39$50.39 Pack Size 5 5 10 10 20 Type 29 27 27 29 29 Material Zirconia Compressed Wool Aluminum Oxide Ceramic Zirconia Diameter 4-1/2" 4-1/2" 4-1/2" 4-1/2" 4-1/2" Arbor 7/8" 7/8" 7/8" 7/8" 7/8" Max RPM 13,000 13,000 13,000 13,000 13,000 Grit 40 - no data 40-120 36-120 60