the direction of arrow 16 after connector 1 has first been fixed to held member 2 by proper placement with fasteners 11 which are driven in via through fastener openings 7 and 8 and held member 2 has been braced and placed properly at the intended position by lowering second flange 6 onto upper side 3 u2032 of holding member 3 for this purpose the second and first fastener openings 9 and 10 associated with one another as a pair are dimensioned and arranged such that in the installed condition they bear interlockingly on fastener 11 u2033 while at the same time the u201c angle element u201d formed by the first and second flanges 4 and 6 is endowed with stiffness by means of the said fastener 11 u2033 driven through them and traversing them after installation the portion a of the said fastener extending between the second and first fastener openings 9 and 10 in the installed condition then forming in the side view according to fig1 and 19 the hypotenuse of a right angled triangle with legs c and d which triangle correspondingly stiffens connector 1 under load l see arrow in fig3 against relative bending and or twisting of its first and second flanges 4 and 6 this stiffening effect which is.