Standard Zinc Shaft Anodes 19mm, 25mm, 1", 28.6mm (1&1/8"), 30mm, 31.8mm (1&1/4") 19mm:  Diameter 19mm ø: 58mm ø1: 19mm h: 56mm Weight: 0.525kg 25mm Anode: Diameter 25mm ø: 58mm ø1: 25mm h: 56mm Weight: 0.480kg 1" Anode: Diameter 25.4mm - 1" ø: 58mm ø1: 25.4mm h: 56mm Weight: 0.500kg 28.6mm (1&1/8")Anode: Diameter 28.6mm - 1&1/8" ø: 58mm ø1: 28.6mm h: 56mm Weight: 0.45kg 30mm Anode: Diameter 30mm ø: 58mm ø1: 30mm h: 56mm Weight: 0.430kg 31.8mm (1&1/4") Anode: Diameter 31.8mm ø: 58mm ø1: 31.8mm h: 56mm Weight: 0.400kg 35mm Anode: Diameter 35mm ø: 65mm ø1: 35mm h: 66mm Weight: 0.580kg