This segment shows our Zirconia flap disc is grinding common. Zirconia flap discs have more significant effect in terms of grinding hard alloy steels and stainless steels. Obviously, the grinding of Zirconia Flap Disc are stronger than Aluminium Oxide Flap Discs, which indicates than Zirconia Flap Disc is more excellent in grinding and polishing. color: blue Made of high-quality alumina zirconia grain., fiberglass to absorb tool vibration and provide extra strength. Superior cut rate and service life. 80 Grit 50mm (2 inch) diameter,overlapping abrasive strips with a cooler and more efficient grinding process. Safety torque spiral design made for quick change, with strong flexibility. for grinding, blending and finishing on a wide range of metal and many other surfaces. Fits for electric drill, grinder and any electric tools. Material:Alumina Type: Quick Change / for Size:50mm(2inches) Grit: 40/60/80 Speed: 20000 RPM Net Weight:405g Package Contents: 90 x sand discs (30 each for 40/60/80 mesh) 3 x pole Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.