I have used MRCS, Inc for my lock boxes. They use 1/2" or 3/8" lucite and provide a security cable to affix the box to whatever. You can reach them at (781) 279-4041. Regards, ************************************************************************ The RADSAFE Frequently Asked Questions list, archives and subscription information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html