This piece is to create
concrete cover in double layered slabs. It
consists of two parts ( base and shaft), that are coupled to one
another. The first part (base) has a fixed height of 30mm. with four
coverage distances of 25, 30, 35 and 40mm. ,and the second part (shaft)
come in nine heights to give (40, 50, 60, 70, 80, 90, 100, 110 and 120
mm.) concrete coverage. This spacer is made to replace bolster, thus
eliminating the use of chair spacers beneath the first network which is considerably cost effective