i suggest getting different types of screws ( flat head, philips head, and allen heads ) you should try to mix it up so if someone wanted to steal them, they would have to bring like a huge bag full of different screw drivers. and what i did also to this was take out my carpent, put down the subs and amp, then screwed it directly to the ground and then layed the carpet back over it which made it a little harder to get to the bolts.