A Reliance  Zinc Anode manufactured in Canada by Metal Distributors Limited to US military specification A 1800 K.

For use in saltwater

Max Prop 63M-4, replaces MP03 or A63 Intermediate

60mm Diameter
Spacing btw larger hole centres 46mm  (every other hole forming an equilateral triangle)
Recess diameter 39mm
Weight 280g

Max Prop 70M-4, replaces MP06 or B70 Multifit

68mm diameter
Spacing btw larger hole centres 50mm  (every other hole forming an equilateral triangle)
Recess diameter 44mm
Weight 390g

Max Prop 83M-4, replaces MP08 or C83 Multifit

79mm diameter
Spacing btw larger hole centres 60mm  (every other hole forming an equilateral triangle)
Recess diameter 47mm
Weight 860g