Hi all, I am looking for a source for a double concave bracket or steel bar so I can drill 3 holes in it, similar to a MF nut, preferably made from a steel or tin, this is for joining two different sized towers (11 inch to 13) together so I can have a CB/ security cameras on my farm. (I have looked at some brackets that are made of nut, bolts, and stamped tin, and they just look jicky to me.) Thanks.