Variety of Options: 6 grits available 60#, 80#, 120#, 180#, 240#, 320# for your grinding needs. The 4-inch diameter fits most angle grinders. Package Includes: Each order contains 20pcs 4" x 5/8" flap discs, 100x16mm size. Choose from 6 grits 60#, 80#, 120#, 180#, 240#, 320# to meet different tasks. Good Function: Coating cooling technology reduces cutting temperature and improves heat dissipation, surface burn marks for a smooth finish. High-speed operation quickly dissipates heat through flaps to maintain bonding and disc shedding. Durable Material: Aluminum oxide abrasives effectively grind on concrete, fiberglass, non-ferrous metals, marble, porcelain, and more surfaces. Wide Application: Ideal for stock removal, grinding, blending, beveling, deburring, and paint removal, finishing on metals, non-ferrous materials, fiberglass, plastics, wood, and other surfaces. Kind Reminder: Please wear eye protetion and keep all guards, and choose the appropriate grit and grinder when grinding.