Check the listing for details. 1pc Brazed Diamond Grinding Wheel Pottery Marble Angle Grinder Polishing Disc. Condition: New. Listed at 18.58 USD. 1 piece Brazed Diamond Angle Grinder Stone Grinding Wheel Semi-circular Straight Edge Round Glass Pottery Porcelain Marble Disc Type：A/B/C/D/E/F/G/H/I Diameter :75mm Inner Dia:20mm Thickness:10/15/20/25/30/40/45mm Please know before buying: For example, if you choose a product with a thickness of 10mm, it means that after using this thickness, the finished workpiece will be 10mm, and other thicknesses are the same. Therefore, when you receive the product, the actual product thickness will be more than 10mm, which is normal, please don't worry. Note: Please allow minor errors due to manual measurement. Thanks for your understanding. Monitors are not calibrated same, item colour displayed in photos may be showing slightly different from the real object. Please take the real one as standard.