Discover Premier Security with Our Letter Box Factory Excellence

About Us

Founded in 1968, it started by manufacturing simple cashier boxes, taking the Taiwan market as its starting point.
• Expanded the second factory in Miaoli Tongluo Industrial Zone to integrate production capacity and R&D team.
• Passed ISO-9002 and ISO-14001 certification, quality is guaranteed.

1980~ 1990
Established its own brand SHYHRU, ​​entered the international market, sold to more than 30 countries in the United States, Europe, Asia, and Africa, and became a leading brand made in Taiwan.
2000~ 2018
• US SENTRYSAFE Taiwan agent.
• Established KINCOO (King of Treasury) brand and entered the e-commerce platform.
• In response to technological trends, we develop a series of electronic combination lock products.
Shiru's strict quality management and innovative development keep its roots in Taiwan and continue to move towards internationalization.




Shyh Ru Metallic Industrial Corp. was founded in 1968, with the aim and aspiration to produce user friendly Cash boxes for customers in Taiwan. At that time, the portable cash box market was dominated by Japanese brands.


To build a presence and reputation in the local market, Shyh Ru launched a small range of cash boxes. Shyh Ru promptly started taunting bigger brands with its determination and growing market share.


In 1984, Mr. Tai-Ho Chang, general manager of Shyh Ru, made a bold and wise decision to go international. In order to meet clients’ unique and particular requests and needs, Shyh Ru developed several products in addition to its flagship cash box product. Shyh Ru has since been growing and expanding steadily and today offers a wide range of quality products such as key boxes, mail boxes, seal boxes and customized solutions.


In 1999, Shyh Ru received ISO-9002 product quality certification and ISO-14001 environmental management certification. These certificates are an embodiment and reflection of Shyh Ru’s commitment to quality first and customer foremost. Shyh Ru is motivated to continue honoring its promises and commitment to produce high quality products beyond requirements of the ISO certificates.


In recent years, Shyh Ru has focused on research and development to produce new and innovative products for its clients, while at the same time enhancing its quality standard. To ensure the highest possible security for its clients, features utilizing state of the art technology such as alarm systems and digital keypads are built and incorporated into Shyh Ru’s latest models of the cash boxes and key boxes.


With its exemplary quality, first rate service and product warranty, Shyh Ru has established its reputation as a reliable and excellent manufacturer on the global market, selling to over 30 countries around the world. To better serve its clients, Shyh Ru will continue to innovate and enhance its brand name and presence in international markets.


As a prominent letter box factory, we take pride in our ability to provide exceptional security solutions that cater to the needs of customers worldwide. With Shyhru, you can trust that your valuable possessions are in safe hands.


At our letter box factory, we understand the importance of protecting your valuables with utmost care and precision. We offer a wide range of cutting-edge products that combine functionality with elegance. Our team of skilled craftsmen and engineers work tirelessly to create letter boxes that not only provide unparalleled security but also enhance the aesthetics of any environment.When it comes to security, we leave no stone unturned. Our innovative designs incorporate advanced locking mechanisms, reinforced materials, and industry-leading technologies. Each letter box is meticulously crafted to withstand tampering attempts and provide you with peace of mind.


When you choose Shyhru, you're not just investing in a letter box. You're investing in a comprehensive security solution that combines reliability, durability, and innovation.  In conclusion, experience the excellence of a premier letter box factory and secure your valuables with Shyhru. Explore our range of innovative security solutions today and discover the peace of mind that comes with superior protection.