Additional followup ...

You can see the Enkay Screw Bit Holder ... and other great stuff on the Enkay Products Page. 

I bought some of my security bits (but not the ones that were in the image that started
this thead) by visiting Tamperproof Screw Co. of NY -- you don't want to try to get into
something secured with those products without the right bits.  ... the "Breakaway Nut /
Non-Removable Security Nut" are an especially nasty item. 

Note photo interest ... nice photos of small items. 

--
Martin