I'm not sure where the holes came from...they measure .45, .40, 9mm, .22, 7.62x39, 7.62x25 and .223. 
For some reason some of the insides are a little loose.  I think one of the wires came off too.  When I plug it in, it just sparks...  Well, on the bright side, the damn thing will NEVER LOCK UP ON ME AGAIN!!! HAAAAAA!