LTHYUN008 Hyundae heavy duty lever lock set ANST Grade provide superior security, durability, and reliability compared to lower grade locks. They are an excellent choice for anyone seeking maximum protection for their property. ANSI Grade 1 lever lock sets offer the highest level of security and are typically used 6 in commercial or high-security applications. They are designed to withstand significant physical attacks, making them highly resistant to picking, drilling, and forced entry. Grade 1 lever lock sets are constructed with high-quality materials, such as solid brass or steel, making them extremely durable and long-lasting. They can endure heavy usage and are capable of withstanding harsh environmental conditions. ANSI Grade 1 lever lock sets are rigorously tested for their reliability. They have to meet strict performance standards, including operational, strength, and security tests, ensuring that they are dependable and perform consistently over time.