Maximized efficiency and productivity without compromise The deephone series - formaly GNM - from the Gehring horizontal honing machine product line combines maximum efficiency with a balanced compact design. This allows for an efficient and economical honing of precision cylinders and large parts. The honing-control is easy to understand, and significantly boosts the user-friendliness of the machine. Once put into operation, the machine stands out for its high productivity and availability. The overall package is optimally rounded off by very short delivery times for machines and tooling.