combination of said end wall and a pair of spaced parallel horizontal walls 18 and 20 extending at right angles from opposite edges of the end wall a pair of coplanar rectangular ears 22 are joined to and extend away from the respective horizontal walls 18 and 20 at right angles thereto at or near the open end of the channel said ears extending in opposite directions and being substantially parallel with the end wall 14 the width of the ears 22 is preferably smaller than the width of the end wall 14 and the side edges of the horizontal walls 18 and 20 preferably converge toward the ears thus in the preferred embodiment the horizontal walls 18 and 20 are preferably in the form of trapezoids with the side edges thereof converging toward the ears 22 in addition reinforcing webs 24 are provided between the walls 18 and 20 are the respective ears 22 whereby to better support the ears are preferably in the form of a right triangle with the hypotenuse extending between the outer corner of each ear to a respective corner of the end wall 14 thus the webs extend along and are joined to the converging side edges of the walls 18 and 20 and are also joined to the side edges of the ears 22 fig5 illustrates the connector being employed to join a pair of rectangular members 30 and 32 in a spaced or edge to edge relation wherein the members are at right angles to each other it may be seen that one of the members 30 such as.