Their customer service is much improved! But first I will describe my early skepticism...
A few years ago I have mentioned that I have had several instances of bad luck in dealing with American Security (safes). I tried to buy a spare shelf a while back with frustrating "they will call you back" and countless voicemails. After describing my problems to the place I purchased it they said that they had the same problem and they gave me a shelf from their inventory! Definitely a life customer there.
I had also bought a little S&W-branded (AmSec made) travel safe for carrying a handgun. It was finger pattern activated (or key) and could be bolted to an included plate that I was thinking of bolting in the trunk. My first clue of its quality should have been all of the S&W phone #'s covered with a basically "don't call us (S&W) call the maker AmSec" stickers on it. One day the safe just locked open...with the key in it. I guess I should have been happy it wasn't locked closed. I pulled the warranty card to find that it had looooong expired (I don't even think it was 90 days). It's now a paperweight.
These experiences led me to use my AmSec for only storing paperwork (the AmSec that worked), but to be honest I needed a bigger safe anyway. AmSec was not on the list of brands I looked at. But I digress...
Anyway, in all of AmSec's documentation I can't find the bottom bolt hole sizes. So the other day I called AmSec and was routed to customer service. It said that there was one person ahead of me -- and within a couple of minutes a live person answered!
She looked up up the bolt size (1/2") and even emailed me a pdf! Excellent customer service! Weird that their anchoring document shows a bolt with a PLASTIC expansion sleeve, but really the size is all I wanted to know. I include it here now. For my next safe (running out of room again) I will reconsider AmSec.