ASSA Twin 6000 Classic High Security (Brass Look) Deadbolt Complete with Box One of The Best Security Deadbolts there is! Product Description: The ASSA 6000 Series deadbolt is designed to withstand any form of physical attack including drilling, prying, or pulling. Its free spinning guard collars protect it from pipe wrenching while its hardened inserts guard against drilling. Plus: 3 keys. Only (No Taxes) $345.00 cash.