Z Guard Zinc pear shaped bolt-on hull Anode 2.1 Kgs Nominal Net Weight. The kits come with the anode, a deep polyethlene backing pad, 2 x M10 nuts and serated washers. Sold in single quantities. Box size: 10. Since 1977 Z-Guard has manufactured sacrificial anodes for the major UK boat builders, lifesaving organisations and other recognised trusted UK brands.  Z-Guard has an unrivalled proven pedigree, DNV-GL certified & produce to military specifications Mil-A-18001K, Mil-A-24779 & Mil-A-21412A.