Abstract: The present invention relates to a fastening system for angle plates which include support arms to provide a more precise and reliable connection and attachment between the angle plates comprising an inner support member having two side walls defining an angle of about 90 degrees therebetween and two upper surfaces defining an angle with the side walls, each having an opening or bore cut therethrough; an outer support member having two side walls defining an angle of about 90 degrees therebetween, the inner support member and the outer support member having a threaded bore centrally cut therethrough; each angle plate having side walls and upper surfaces to position its support arms, each of the upper surfaces having an opening or bore cut therethrough to cooperate with the bores in the upper surfaces and with the support arms to firmly maintain the support arms in a stable position.