PURPOSE: To lengthen the effective cutting length for improving cutting ability and make a saw display high performance without forcing with teeth diagonally formed by continuously and zigzag forming an effective cutting section diagonal to the longitudinal direction of a steel band on the top of the thick wall section of the steel band, whose cross section is like a plectrum.

CONSTITUTION: A band-like body A with teeth whose trianglepyramid-like cutting sections 4 and 4a, whose side faces are like saw-teeth, are continuously and alternately formed from both sides of a steel band on the thick-wall section 3 of the steel band whose cross section is like a plectrum, and having teeth, whose effective cutting sections 5 and 5a are formed continuously and zigzag and diagonal to the longitudinal direction of the steel band, on the top of the thick-wall section is obtained. In the body A with teeth, the corners 6 and 6a comprising the effective cutting sections 5 and 5a crossed each other become the shapes of the base section 2 comprising both the side projected, and both corner 6 and 6a of each effective cutting sections 5 and 5a perform setting working. The included angle and cutting angle are freely adjustable by varying the angle and included angle of the blade of a cutter when the cutter is brought into contact with a steel band, and cutting angle can be varied to both acute angles and obtuse angles.