For summers, wooden bars are usually used with a cross section of at least 20 x 20 cm. The need for wooden struts can be reinforced between them spacers. In order for the spacers do not fail, despite their tight factory, the strips are sewn to the struts. The spacers themselves are sewn with two 15-cm nails. Included struts recently are used less and less. They are used mainly for eyelids of small buildings with low durability of brickwork.