Sunnen Silicon M27 Honing Stone M27j45 M27j17 Portable Honing Head. High Precision Quality: Manufactured with high quality abrasive and metal powder, strictly abiding by ISO9001 quality management system. Extended Service Life: Advanced manufacture technology and formula system effectively extend the service life of honing stones. Wide Machine Compatibility: Compatible with most home and abroad honing machines including Sunnen, Gehring, Chishima, and Nissin. Customization Available: Customized honing stones and tools available based on customer requirements, samples, or designs. Professional Manufacturer: Professional manufacturer with 13 years of production experience in honing stones and superabrasive grinding wheels. High Production Efficiency: Advanced technology multiplies production efficiency while ensuring high precision honing quality. Flexible Customization: Offers full customization, minor customization, and flexible customization options from samples or designs. Quality Inspection: 100% visual inspection of finished products with traceability of raw materials and 3 QA/QC inspectors.