1970, H.Y Liao-the owner of company, started the business in a small workshop.

1975, Dot To Surface Enterprise Co., LTD. was established in Chai-Yi, Taiwan.

1998, the branch company, San Yi Chains Hardware Co., LTD. was setup in Guangdong, China.

Ecperience of chain business for many years, we have kept evolve us into a high-quality test room with
various testing instruments.


Dot To Surface & San Yi continue to improve our products and service for you.