Accessories for oscillating power tools

An accessory comprising:

• an attachment portion configured to be coupled to an oscillating power tool;
• a working portion coupled to the attachment portion and extending generally along a longitudinal axis, the working portion having a planar wedge shaped body bounded at least partially by a non-cutting rear end with a first width, a front cutting edge opposite the rear end with a second width that is greater than the first width, a first side cutting edge extending from a first end of the rear end to a first end of the front cutting edge at a first angle to the longitudinal axis, and a second side cutting edge opposite the first side cutting edge and extending from a second end of the rear end to a second end of the front cutting edge at a second angle to the longitudinal axis, wherein the front cutting edge has a straight center portion and first and second convex curved lateral portions continuous with and extending laterally outward from the center portion, the central portion having a third width that is greater than a sum of a fourth width of the first convex curved lateral portion and a fifth width of the second convex curved lateral portion.