An arrangement for holding spaced opposite sheating boards of a construction form against movement away from each other during pouring of concrete or the like between the boards, in which an elongated metal strip extends between and with opposite ends beyond the boards. The strip is provided with a plurality of fixing holes arranged equally spaced from each other in the longitudinal direction of the strip and a plurality of elongated locking holes spaced from the fixing holes and from each other in the longitudinal direction of the strip. The arrangement includes further a first abutment means which abuts against the outer face of one of the boards and which includes a fixing member which may be a pin or a wedge driven into one of the fixing holes, whereas the second abutment means abuts against the outer face of the opposite board. The second abutment means includes a wedge driven in one of the elongated locking holes. The reference spacing of the fixing holes and that of the locking holes, the length of each locking hole and the wedge of the second abutment means are constructed and dimensioned in such a manner to assure that the opposite boards can be held against movement away from each other regardless of the desired spacing between the boards.