TEC-40 Hull Zinc Anode TEC40 A40

Length:  7-1/2"
Width:  2-3/4"
Thickness:  1/2"
Horizontal Hole Distance:  1-3/4" center-to-center
Vertical Hole Distance:  1-3/8" center-to-center
Hole Diameter:  1/4"
Weight:  2.1 lbs

US Military Grade Zinc Anode. Zinc Is For Salt And Brackish Water Use.