This type of metal fastener is suitable for softwood indoor joining. Corrugated metal fasteners are sharpened on one end. Position the two pieces of wood together to form a T joint. Use a clamp or block to push the joint tightly into position before using the fasteners.
The fasteners should then be positioned parallel to the cross piece length and well in from its edge. Two should be positioned side by side to cover half the flat timber and half the cross piece. When in the correct position, tap the fasteners evenly into the wood. Hammer them from the middle until they are flush with the surface of the two woods.