When the depth of the saw armor steel is not more than 2/3 the thickness of the armor, steel armor can not be sawed intralesional sheath incision to tidy without any sharp burrs.
When sawing steel armor depth does not exceed 2/3 of the thickness of the armor, sawn-off steel armor shall not damage the inner sheath, the incision should be neat, there must be no sharp angle burrs.
When sawing the steel armor, the depth shall not be more than 2 / 3 of the armor thickness. When sawing the steel armor, the inner sheath shall not be damaged. The cut shall be neat and free of sharp corners and burrs.