Steel knob bars: hammered rods with forged knobs, single or double, centered or off-center. Square 13 × 13 and 15 × 15 mm, as well as round 12 and 14 mm, in heights of 900, 1000, and 1250 mm. The knob is carved directly from the rod, not attached separately. Matching intermediate bars of the same height complete the panel to form a continuous filler.