Package Contents: 225mm Sanding Disc, 50 round sanding discs, 225mm diameter, 8 pre-drilled holes for dust extraction, 50 pieces in a box (10 pieces of each grit size: 40/60/80/120/240). Durable and practical for grinding. You can choose different grits of sand according to your needs. 【Easy to Use】 Self-adhesive sanding disc, quick and easy to attach, sturdy and durable, it won't fall off once installed and in use, easy to install and remove. 225 mm Diameter Abrasive Discs. The abrasive discs fit perfectly on the mounting plate, are easy to replace, and can be used wet or dry. 【HIGH QUALITY】 The abrasive disc features a thick, D-grade paper backing, a high-quality aluminum oxide abrasive disc, and specially heat-treated aluminum abrasive, offering excellent polishing, sharpness, and wear resistance. The durable, antistatic, and high-strength resin bonding system ensures a long service life. A good choice for sanding and polishing. 【Compatible】 225 mm for long-reach sanders, drywall