Benchmark Abrasives 40 Grit Premium Type 27 Zirconia Flap Discs, Angle Grinder Benchmark Abrasives 4" flap discs are ideal for surface blending, beveling, grinding, deburring, edge chamfering, finishing, stock removal, etc. on a variety of ferrous and non-ferrous materials. Zirconia Flap Discs are manufactured using European zirconia cloth. The European material is superior due to its uniform particle size and premium blend of ingredients. Designed to meet industrial standards, our high-quality flap discs are recommended to be used with angle grinders sized 4?. These type 27 flap discs are versatile products that can be used for aggressive stock removal to surface blending. Efficient flap discs are used in various industries like automotive, transportation, mining, shipbuilding, construction, welding, foundries, fabrication, etc. All our abrasive products are made with quality materials and exceed ANSI and EU European Standards. We trust in delivering high-quality products to the end-user. Customer satisfaction is the lifeline of our brand.