About This Specifications: PLANTEX Aluminum Flap Disc features a 4-1/2" diameter, a 5/8" x 11 spin-on arbor, and is available in a 120-grit size. Enhanced Durability: Designed with a unique formula, these flap discs last longer than competitors, making them a cost-effective choice for users. Eco-Friendly Design: Manufactured using 50% less energy, the discs feature a plant-based backing made from natural hemp, which absorbs heat and sound while being impact-resistant. Versatile Applications: Ideal for grinding, blending, and finishing aluminum and other non-ferrous materials; the fiber backing is flexible and easily trimmable for use in tight spaces. Safe to Use: The fiberglass-free construction ensures safer operation by eliminating harsh fumes, airborne fibers, and sharp pieces, enhancing user safety during application Overview Grit Material : Zirconium Product Dimensions : 4.5"L x 4.5"W Brand : CS Unitec Compatible Devices : VARILEX® Speed-Controlled Angle Grinder Grit Type : Medium