Each alignment assembly includes an internally coarse threaded housing w/wrench flats which contains a teflon insulator that mates with a spherical headed stud w/fine thread. The 3/4" and 1" units have a delrin insulator. Includes (1)fine jam nut and (1)coarse jam nut. Side of housing has 1/4-20 tapped hole for attaching ground strap. Grounding screw not included. Zinc and clear chromate plated.