Size:4 Inch Thank You for choosing Konfor to purchase your Diamond Polishing Pads. We really appreciate your business. Konfor diamond polishing pads are 100% brand new and are designed for high polishing performance, cut fast and aggressively. The pads can be wet or dry use, wet polishing can provide great results. This pack carries 7 Pieces of 4 Inch / 100mm Resin (more durable than standard grade polishing pad) Diamond Premium Polishing Pad for concrete granite travertine stone. Package Included: 1 X 50 Grit Polishing Pads 1 X 100 Grit Polishing Pads 1 X 200 Grit Polishing Pads 1 X 400 Grit Polishing Pads 1 X 800 Grit Polishing Pads 1 X 1500 Grit Polishing Pads 1 X 3000 Grit Polishing Pads. We also sale same grit for 7pcs set such as Grit 50 of 7 pcs or Grit 100 of 7 pcs, you can make comment about the grit you want when you purchase and Please choose SHIP BY SELLER NOT FBA. If you like to purchase 3 inch please refer to ASIN : B07GNRC8BS, 5 inch refer to ASIN : B07GNMFYPJ . INSTRUCTIONS: Install the rubber backer on to the variable speed angular hand grinder. Attach the polishing pad Velcro loop side to the backer Velcro loop side, so they form a tight bond. Make sure that the pad is CENTERED on the backer pad. If it is not centered it will shorten the lifespan of the polishing pads. FOR BEST RESULTS AND YOUR SAFETY: Please wear protective eye wear and gloves while operating the grinder. Also add a little water to the surface when you operate.