Is this a wall plug or what is it?

[Bygga_42]

 

[Fotografen]

Looks like something nailed with a nail gun.

 

[Snickarkirre]

It's a shot pin from a nail gun. Do you want to remove them? In that case, just break the board with a crowbar and hammer, and then cut the pin with a reciprocating saw.

 

[Bygga_42]

It is a nail from a nail gun. Do you want to remove them? In that case, just split the board with a crowbar and a hammer and then cut the nail with something like a reciprocating saw.

Planning to install a dishwasher in that spot.

So, I want to remove them.

Isn't it possible to pull them out?

 

[Dilato]

If they are nailed into concrete, it can easily create large holes if you try to pull them out. The easiest way is to cut them with an angle grinder.

 

[Bygga_42]

If they are nailed into concrete, large holes can easily form if you try to pull them out. The easiest way is to cut them with an angle grinder.

Can it be done flush with the washer?

 

[Dilato]

Is it possible to do it flush with the board?

Depends on how skilled you are with the angle grinder, but why would you do that?
Crack the board around the nail (hammer and chisel work) so you can remove it, then go at the nail with the angle grinder.