The Hitachi triangle key adopts a triangular cross-section design, which seamlessly matches the internal structure of the lock core, which not only improves the opening efficiency but also enhances the durability of the key; the key body is made of alloy material, which has high strength, corrosion resistance, wear resistance, and other characteristics; The key is compact and easy to carry. In addition to being suitable for specific equipment of the Hitachi brand, the Hitachi triangle key is also widely compatible with other systems using similar lock cylinder designs.