Coupler is made of billet heat treated steel and has been black oxide finished. It has 3/8" and 5/16" bolt holes. The coupler comes bored for 1.500" but can be used for 1.300" or 1.250" with a coupler register sleeve that must be purchased separate. Coupler end to end measures 1.875".
If you need help choosing which coupler you need give us a call or drop us a email.