For Two-piece, pancake-style zinc anode for rudders and trim tabs.
Diameter: 3-3/4″
Thickness of One Half: 1/2″
Screw: 5/16″-18 Threads; 1-1/2″ Length.
EMP Zinc anodes conform to Mil-Spec: MIL-A-18001K

also crosses with:
Canada Metals CMR03
Performance Metals R3750Z
GLM 26652
Technoseal R3
Camp R-03
Reliance MDR-3