Sunnen tooling, accessories and supplies are engineered to fit the specific requirements of Sunnen's engine building honing equipment...and to meet the measures of precision that have made Sunnen Products Company the leader in automotive honing systems for more than 80 years. At Sunnen, we are constantly working to improve our automotive honing systems and tools by incorporating the same technology we put into our high-production equipment, tooling and supplies used by OEM engine component manufacturers.