Stretcher bars in 2 and 4cm thickness for stretch mounting of canvas.
2 + 2 stretcher bars are assembled to form a complete stretcher frame.
So if your final canvas is to be 30x40cm, then youl'll need:
If ONE of the side are to be 80cm or larger, a transverse bar should be added.
Say, if you are aiming for a 60x90 cm painting, you should use:
If BOTH sides are to be 80 cm or above, two "cross bars" should be used.
For instance, to make a stretcher frame in 80x100 cm, you should use:
Remember, that the stretcher frame should always be more than 10 cm smaller than the full, unstretched canvas size - because the edges of the canvas look the best when they are folded around the sides of the stretcher frame and stapled on the back side of it (no visible staples on the front and the sides....