The brick bolster (also known as a brick set) is designed to be used on bricks.
You may find that masons’ chisels and brick bolsters are not as sharp as some other types of cold chisel. This is because they are primarily used to break objects, as opposed to cutting them.
Bolsters have a wider cutting edge than cold chisels. They are slightly different to cold chisels in that the specifications they are made to may not be the same.