Cheras Anode - Zinc Propeller Shaft 1 3/4'' RWB3306Photo for illustration purposes please ensure you select correct size These anodes are manufactured from high grade zinc alloy 99. 9% pure and conform to Australian Standard AS2239 and U. S Military specifications. 2 piece anodes to fit around the propeller shaft. Supplied complete with 2 x large Philips head stainless steel bolts and stainless steel nyloc nuts. The anodes have a recess large enough to get a socket spanner around the head of the nut