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Bolt-On Plate Anode - Zinc, 6 in. x 12 in. x 2-1/2 in. Thick
Galvanized steel insert with holes for bolt-on installation - 5/8" holes on 6" centers.
These anodes are built around a high-strength slotted steel mounting insert.
Unlike some competing brands, the steel insert in Sea Shield anodes is galvanized for longer shelf-life and better grounding.
1-1/2" countersunk holes
Built to military specification MIL-A-18001
Made in California, USA