Blade attachment for an oscillating tool

A method of cutting an opening with a power tool, the method comprising:

• simultaneously pressing a first blade portion and a second blade portion of a blade attachment into a surface to be cut, the blade attachment including:
• an intermediate portion coupled to the power tool to be oscillated by the power tool about an oscillation axis, the intermediate portion including:
• a central portion having an upper central surface and an opposite surface directly opposed to the upper central surface, the central portion having an opening extending through the central surface and through the opposite surface in a direction along an opening axis, the opening configured to engage with the power tool;
• a first connecting portion extending from a first side of the central portion, the first connecting portion having a first upper surface that is contiguous with the upper central surface;
• a first extension extending from the first connecting portion along a first direction away from the opening and having a second upper surface that is contiguous with the first upper surface, the second upper surface parallel to the upper central surface and not coplanar with the upper central surface;
• a second connecting portion extending from a second side of the central portion, the second connecting portion having a third upper surface that is contiguous with the upper central surface;
• and
• a second extension extending from the second connecting portion along a second direction away from the opening and having a fourth upper surface that is contiguous with the third upper surface, the opening axis interposed between the second side and the first side, the fourth upper surface parallel to the upper central surface and not coplanar with the upper central surface, wherein:
• the first blade portion is directly coupled to the first extension of the intermediate portion, the first blade portion including a first plurality of cutting teeth;
• the second blade portion is directly coupled to the second extension of the intermediate portion;
• the second blade portion includes a second plurality of cutting teeth;
• the first blade portion and the second blade portion are coupled to the intermediate portion such that the first blade portion and the second blade portion are arranged to mirror one another on opposite sides of the intermediate portion:
• the first blade portion is directly coupled to a fifth surface of the first extension, the fifth surface directly opposed to the second surface;
• and
• the second blade portion is directly coupled to a sixth surface of the second extension, the sixth surface directly opposed to the fourth surface;
• moving the blade attachment in a first direction along the surface to be cut to simultaneously form two parallel cuts in the surface;
• rotating the power tool to align the two blade portions at an angle relative to the two parallel cuts;
• and
• moving the blade attachment in a second direction along the surface to be cut to simultaneously form two further parallel cuts in the surface.