• Removable Thumb-Turn Piece, UL437 Drill and Pick Resistance Cylinder
• Conversion from Single Sided to Double Sided, Bump proof, pick proof and drill resistant
• ANSI Grade 1 Locking Mechanism, MUL-T-LOCK’s Patented Interactive® Key Control System
• UL Fire Rated Latch, Limited Lifetime Mechanical Warranty
• Adjustable Backset (2 3/8″, 2 3/4″), Two high security dimple keys included

Product Description
With its truly unique design the MUL-T-LOCK Hercular deadbolt is truly spectacular. The Hercular is reinforced in just about every way possible. From a UL437 Listed Cylinder, to strong latch, to Bolt Bearing Mechanism, the Hercular Deadbolt will stop almost any attempt at forced entry. Strength usually does not mix with Flexibility. Not in the case of the Hercular, since it is the only Grade 1 Deadlock with an adjustable backset BUMP PROOF LOCK… More >>

HDC-HRC Captive Key Hercular Deadbolt-Bright Chrome