Can someone help me identify this.  It seems to fit over a 60 degree revolving center.  It has a metal ring and two magnets.  I think it is a safety center add on but dont know when I got it or who makes it.  I have a Robust safety center but it does not seem to fit on that.  Pretty sure it would fit over a 60 degree steel revolving center.  Does anyone know who makes this?


				
			
