5ive Star Gear Spy Bolt An Updated And Improved Version Of The Old Soviet Keg "Dead Drop" Hollow Bolt Used During The Cold War Features An O-Ring Seal For Weather-Proof Storage Of Small Valuables, Communications, Etc. Reverse Threading On The Bolt Head For Additional Security Utilizes A 3.43" Long, 3/4" Diameter Bolt Providing A Large Secret Storage Compartment With A Diameter Of .49" And A Maximum Depth Of 2.81" Imported Materials Retooled In The U.S.A.