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 stone, and other countertops after waterproof grinding Note: 1. Actual color may vary slightly from the image due to lighting conditions. 2. Please allow 1–3 cm measurement deviation due to manual measurement. Material: Diamond abrasive + high-manganese steel base Specifications: 20 mm grinding rod (coarse), 20 mm grinding rod (fine), 30 mm grinding rod (coarse), 30 mm grinding rod (fine) 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