Angle Grinder Disc 4-1/2 inch & 3 Different Types include: 20 Packs 4.5"x1/4"x7/8" Cut off Wheels, 5 Packs 4.5"x7/8" 80 Grit Flap Discs, 5 Packs 4.5"x3/64"x7/8" Grinding Wheels.4.5"x3/64"x7/8" Grinding Wheels: 5-Pack Metal Cut-of Wheel is bonded with corundum and white alundum grain and reinforced by double fiberglass mesh, and with 3/64 inch thin design, it can quickly cut without burrs, ensuring safe and reliable cutting without splashing or causing injury.4.5"x7/8" 80 Grit Flap Discs: 5-Pack Made from hard zirconia alumina material, the flap discs last longer than standard aluminum oxide abrasives, Bevel Type 29 Disc Build Is Effective For Contours, Edge And Weld Blending, And Radius Grinding.4.5"x1/4"x7/8" Cut off Wheels: 20-Pack Cut off Wheels is made of high-quality 3 full sheets of fiberglass for durability and safety, with high grain concentration of the grinder disc is made for aggressive grinding action and smoother running wheels.Durable performance: The 30 pack angle grinder wheel set is fully compatible with all 4-1/2-inch angle grinders, with a 7/8-inch spindle and speeds up to 13300 RPM and 80M/S. Therefore, professional craftsmen can expect sustained and stable performance to tackle more challenging tasks.