garna -gar- gismu

x1 is a rail/railing/bar [tool] supporting/restraining x2, of material x3.

See also kamju, grana, tutci.


In notes:

grana
x1 is a rod/pole/staff/stick/cane [shape/form] of material x2.
kamju
x1 is a column/pillar of material x2.
tutci
x1 is a tool/utensil/resource/instrument/implement used for doing x2; [form determines function].