D-I Industrial Co., Ltd. specializes in the manufacture of marine transmissions (gearboxes), hydraulic steering systems and power take-offs (PTOs).

The company is one of the largest manufacturers and suppliers in Korea with over 65% share of the domestic market. The company's main products, marine transmissions, are operated with hydraulic clutch systems.
For hydraulic steering systems, the company produces 12 standard models for power steering systems, 4 standard models for manual steering systems and various PTO models with maximum output of from 87.5kw to 400kw at 1800 rpm.

Major Korean manufacturers of marine engines such as Doosan Infracore Industries and Hyundai Machinery Co. use our marine transmissions for their engines.
Furthermore, the local authorized distributors of major global marine engines such as Cummins, Volvo Penta, Caterpillar and John Deere also choose D-I marine transmissions due to their quality and reliability.

Annual revenue is approximately US$25 million, 45 percent of which is accounted for by exports.
The company employs a workforce of 92 professionals, including 10 R&D centar.