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: Perfect for grinding inner curves, arc edges, and sink holes on marble, granites, 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, ideal for pros and DIYers Smoothing, Chip-Free Finish: Delivers a clean, polished surfaces without chipping, ensuring professional results before sealing or installation Wide Application: Suitable for marble, quartz-stone and other countertops after the waterproof grinding Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Material: Diamondabrasive + high-manganese steel base Specifications: 20mm grinding rod (coarse sand), 20mm grinding rod (fine sand), 30mm grinding rod (coarse sand), 30mm grinding rod (fine sand) Size: 5x2x2cm, 5x2x2cm, 5x3x3cm, 5x3x3cm Package List: 1x Precise Diamond-Brazed Finger Bit Grinding Wheel