The LokDown System embeds a stainless steel cable 20" into the terrain, locking the RocLok lock box in place with a US made DUCKBILL® Earth Anchor*. Much like a toggle bolt works to secure fasteners to drywall, the Duckbill Earth Anchor is driven vertically into the soil and rotates horizontally against the undisturbed soil when tension is applied to the cable. The other end of the cable can be built into any** RocLok key hider you'd like. Once installed, 9 inches of cable tucks discreetly underneath the rock allowing you to easily access the locking key chamber beneath.