Pretty patterns.
That beak doesn’t look like it could take on an Oak and win, can it ?
Never seen any woodpecker or flicker attack an oak. Bugs prefer the softwoods and the birds go where the food is.
The Japanese style heavy lintel of my rear garden gate has a hole about 3/4” dia. with a spalled area at least twice that. One of the larger redheaded types. Interesting thing about them is that when mutual spotting occurs in the woods, the woodpeckers just move to the blind side of the trunk rather than flying off.