Founded in 1924, St. Louis based Sunnen Products Company has long been the worldwide leader in industrial bore sizing and finishing systems. Today, Sunnen is the largest, fully integrated company in the field. Sunnen's bore sizing systems range from basic manually-operated honing machines to fully automated systems that provide every necessary function for bore sizing from honing and gaging to part handling, and even post-honing operations such as deburring and bushing or pin-insertion. Sunnen also manufactures the top selling tube hone for medium duty applications. All Sunnen systems are fully supported by the experts in the St. Louis headquarters.

Sunnen's bore sizing systems use a wide variety of tools and abrasive to size and finish bores of all sizes. The use of Sunnen machines, tooling and abrasive products allows precise size, surface finish, roundness, straightness and consistent surface texture to be achieved quickly and economically in tool room/repair, mid-volume/job shop, high-volume production applications. All Sunnen systems are fully supported by experts from around the world.