A reciprocating saw blade for use with a reciprocating saw , the reciprocating saw blade comprising: a body defining a longitudinal axis ; an attachment portion coupled to the body , the attachment portion including a tang and an aperture configured to couple to the reciprocating saw , wherein the attachment portion is angled relative to the longitudinal axis by a tang angle (A); and a cutting portion formed on the body , the cutting portion including a plurality of cutting teeth , each cutting tooth including a tip and a relief surface extending from the tip ; and wherein the tips of the plurality of cutting teeth define a plane that is parallel to the longitudinal axis , and wherein the relief surface of each cutting tooth intersects the plane at a relief angle (C), characterised in that : each cutting tooth further includes a non-cutting protrusion extending from an end of the relief surface opposite the tip , each cutting tooth defining an effective relief surface that extends from the tip and is tangent to the non-cutting protrusion ; in that a distance (S) between effective relief surfaces of adjacent cutting teeth is at most 1.5 mm (0.06 inches); in that the effective relief surface of each cutting tooth intersects the plane at an effective relief angle (F), and wherein a ratio between the relief angle (C) and the effective relief angle (F) of each cutting tooth is 1.6; and in that the effective relief angle (F) is between the tang angle (A) and the relief angle (C). a body defining a longitudinal axis ; an attachment portion coupled to the body , the attachment portion including a tang and an aperture configured to couple to the reciprocating saw , wherein the attachment portion is angled relative to the longitudinal axis by a tang angle (A); and a cutting portion formed on the body , the cutting portion including a plurality of cutting teeth , each cutting tooth including a tip and a relief surface extending from the tip ; and wherein the tips of the plurality of cutting teeth define a plane that is parallel to the longitudinal axis , and wherein the relief surface of each cutting tooth intersects the plane at a relief angle (C), characterised in that : each cutting tooth further includes a non-cutting protrusion extending from an end of the relief surface opposite the tip , each cutting tooth defining an effective relief surface that extends from the tip and is tangent to the non-cutting protrusion ; in that a distance (S) between effective relief surfaces of adjacent cutting teeth is at most 1.5 mm (0.06 inches); in that the effective relief surface of each cutting tooth intersects the plane at an effective relief angle (F), and wherein a ratio between the relief angle (C) and the effective relief angle (F) of each cutting tooth is 1.6; and in that the effective relief angle (F) is between the tang angle (A) and the relief angle (C). each cutting tooth further includes a non-cutting protrusion extending from an end of the relief surface opposite the tip , each cutting tooth defining an effective relief surface that extends from the tip and is tangent to the non-cutting protrusion ; in that a distance (S) between effective relief surfaces of adjacent cutting teeth is at most 1.5 mm (0.06 inches); in that the effective relief surface of each cutting tooth intersects the plane at an effective relief angle (F), and wherein a ratio between the relief angle (C) and the effective relief angle (F) of each cutting tooth is 1.6; and in that the effective relief angle (F) is between the tang angle (A) and the relief angle (C). <EOS>