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 100 mm Tools: Compatible with angle grinders and polishing machines for easy installation and stable performance—suitable for professionals and DIY users. Smooth, Chip-Free Finish: Delivers clean, polished surfaces 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 lighting conditions. 2. Please allow a 1–3 cm measurement tolerance due to manual measurement. Material: Diamond abrasive + high-manganese steel base Specifications: - 20 mm grinding rod (coarse grit) - 20 mm grinding rod (fine grit) - 30 mm grinding rod (coarse grit) - 30 mm grinding rod (fine grit) Dimensions: 5 x 2 x 2 cm, 5 x 2 x 2 cm, 5 x 3 x 3 cm, 5 x 3 x 3 cm Package Includes: 1 x Diamond-Brazed Finger Bit Grinding Wheel