Length: 6" Width: 6" Thickness: 1/2" Weight: 4.70 lbs All plate zinc anodes are cut as per dimensions . These Zimar plate boat zincs are undrilled for bolt-on attachment. Whether your boat is sailing in either fresh or sea water is inevitably exposed to the hazards of corrosion. This is why our plate zinc anodes weigh more than the competition, due to their higher quality and perform their cathodic protection job better. Our plate zincs meet the standards set forth by Mil-Spec A-18001, Mil-Spec A-18001A, and Mil-Spec A-18001K.