Accessories for oscillating power tools

An accessory for use with an oscillating power tool comprising:

• an attachment portion having a first planar member, a second planar member parallel to the first planar member, a central opening defined in one of the first planar member and the second planar member, a keyed sidewall having a twelve point star shape disposed circumferentially around the central opening and extending from the first planar member to the second planar member transverse to the first planar member and to the second planar members, and a plurality of equiangularly spaced recesses defined in one of the first planar member and the second planar member, the recesses radially aligned with points of the twelve point star shape of the keyed sidewall and spaced apart from the keyed sidewall and not in communication with the central opening;
• and
• a working portion couplable to the attachment portion and configured to perform an operation on a workpiece.
• wherein one of the first planar member and the second planar member extends radially inward from the keyed sidewall and the other of the first planar member and the second planar member extends radially outward from the keyed sidewall,
• wherein the twelve point star shape of the keyed sidewall is configured to be engaged by a first mating geometry of an oscillating power tool, and
• wherein the plurality of recesses are configured to be engaged by a second mating geometry of an oscillating power tool.

An accessory for use with an oscillating power tool comprising:

• an attachment portion having a first planar member, a second planar member parallel to the first planar member, a central opening defined in one of the first planar member and the second planar member, a keyed sidewall disposed at least partially around the central opening and extending from the first planar member to the second planar member transverse to the first planar member and to the second planar member, and a plurality of equiangularly spaced recesses defined in one of the first planar member and the second planar member, the recesses spaced apart from the keyed sidewall and not in communication with the central opening;
• and
• a working portion couplable to the attachment portion and configured to perform an operation on a workpiece,
• wherein the keyed sidewall comprises a plurality of adjacent V-shaped wall portions, each V-shaped wall portion composed of a pair of wall portions that converge at an outer point as they extend radially outward from the central opening and that are joined at an inner point to an adjacent pair of V-shaped wall portions to form an at least partial star shape,
• wherein each of the first planar member and the second planar member are free of any protrusions extending from the first planar member and the second planar member,
• wherein the keyed sidewall is configured to be engaged by a first mating geometry of an oscillating power tool, and
• wherein the plurality of recesses are configured to be engaged by a second mating geometry of an oscillating power tool.