BL4 HARD STEEL MANDREL Optimize your honing operations with

Optimize your honing operations with Sunnen 3HPH Tooling—engineered for high-performance

The Sunnen A-18 Honing Tooling System is engineered for precision honing of small-diameter bores

Whether you are in automotive

and consistent stock removal

BL4 HARD STEEL MANDREL Optimize your honing operations withThe Sunnen BL4 Mandrel offers dependable performance for honing small to medium sized bores with exceptional accuracy and surface finish. Engineered for durability and ease of use, it delivers consistent, repeatable results across a variety of materials and applications. Fully compatible with Sunnen honing systems, the BL4 is the trusted choice for shops demanding precision and efficiency.