and high quality Material: Diamond + resin Color: as shown in picture These grinding discs use diamond as an abrasive and are combined with composite material. They feature a sticky cloth on the back for attachment to a milling machine. They are mainly used for processing, repair, and renovation of stone, glass, floor tiles, marble, concrete, cement, and similar materials. With strong grinding power, good flexibility, and durability, they are ideal for stone grinding and polishing, providing a smooth finish with high gloss. Features: 1. Uses diamond as an abrasive combined with composite material. 2. Sharp, wear-resistant, highly efficient, and provides strong grinding performance. 3. Fast polishing, durable with long service life. 4. Leaves no residue or discoloration on stone after polishing; ensures good smoothness. 5. Suitable for use on stone, glass, ceramics, crystal, ceramic stone, concrete, and similar materials. Specifications: Diameter: 75mm & 100mm / 3" & 4" Thickness: 4mm (0.15") Granularity: 50#, 100#, 300#, 800#, 1500#, 2000#, 3000# Quantity: 1 set Note: Due to differences in monitor displays, the image may not reflect the actual color of the item. Thank you!