Features High-Efficiency Diamond Material: Made with premium industrial diamond for fast cutting, long service life, and precision shaping, saving time and effort in stoneworking tasks Versatile Stone Grinding: Ideal for grinding inner curves, arc edges, and sink holes on marble, granite, and engineered stone, especially after waterproof arc treatments Fits Standard 100mm Tools: Compatible with angle grinders and polishing machines for easy installation and stable performance, suitable for professionals and DIY users Smooth, Chip-Free Finish: Provides a clean, polished surface without chipping, ensuring professional results before sealing or installation Wide Application: Suitable for marble, quartz, and other countertops after waterproof grinding Notice: 1. Actual color may vary slightly from the image due to different lighting conditions 2. Please allow 1-3 cm deviation due to manual measurement Material: Diamond abrasive + high-manganese steel base Specifications: 20mm grinding rod (coarse), 20mm grinding rod (fine), 30mm grinding rod (coarse), 30mm grinding rod (fine) Size: 5x2x2cm, 5x2x2cm, 5x3x3cm, 5x3x3cm Package List: 1 x Diamond Brazed Finger Bit Grinding Wheel