The uppermost along the topsides is called the sheer strake. HDMLs were fitted with a deeper section rubbing strake aft. A 6-inch strake of armor protected the casemates. The upper armour strake and the armour protecting the casemates was thick. The upper strake of armor protected the casemates and was thick. A strake of armor protected the casemates. Her 5-inch upper-armour strake would have been removed and her deck armour reinforced. Above that was a 6-inch strake that protected the casemates. Above this strake was a thinner one, 130 millimeters thick, that protected the casemates. The barbettes were thick, but only behind the upper armour strake. In clinker boats, the rubbing strake was applied to the outside of the sheer strake. The "L" also introduced a longer dorsal strake that reached to the rear window. The casemate secondary battery was protected by a strake of armor that was thick. Above this was a strake of 8-inch armour. Above this was a strake of armour thick.