The M-4766-DT Threaded Assembly bushing is for the M-4766-T anti-rotation assembly, which welds into place. 2 pieces are required per assembly. The tapped 1/2" - 20 bushing is made from 3/4" RD 64 titanium and measures 11/16" O.D., and length is 1". There is a pdf chart that can be downloaded from our website, http://mckinneycorp.com/downloads/pdf/bushing.pdf, that will give you a list of some of the bushings that we carry. Should you not be able to find the bushing that you're looking for, call and we'll be happy to assist you in finding what you need.