| 1. A guiding device for guiding movement of a saw blade of a band saw, the guiding device comprising:
a holder base having a base portion for mounting to a part of the band saw, and two supporting arms parallel extending from
the base portion, the supporting arms each having a through hole defined by an axis which is normal to both lateral sides
of a saw blade guide by said guiding device and
two saw blade guiding units each having a sleeve respectively fastened to the through holes of the supporting arms and provided
with an axial hole, a ball rotatably received in the axial hole of the sleeve, and a wheel having a metal wheel shaft with
one end inserted into the axial hole of the sleeve and stopped at the ball, and a wheel body made of ceramic material and
connected to the other end of the wheel shaft for stopping against one lateral side of the saw blade.
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