An accessory (700, 800, 900, 1000) for coupling to an attachment mechanism of an oscillating power tool, the accessory comprising: a working end portion (702, 802, 902, 1002); and an opposite rear end portion (710, 810, 910, 1010) configured to be coupled to a plurality of different configurations of attachment mechanisms for oscillating power tools, the rear end portion including: a generally U-shaped opening (708, 808, 908, 1008) open to the rear end portion (710, 810, 910, 1010), the U-shaped opening (708, 808, 908, 1008) having a central portion configured to receive a central post of a tool clamping mechanism, and a rearward portion in communication with the central portion and open to the rear end portion of the (710, 810, 910, 1010) accessory; a first plurality of openings (712, 812, 912, 1012) in communication with and extending radially outward from the central opening, the first plurality of openings including a first radial arm slot (712a, 812a, 912a, 1012a) extending from the central portion at 90 degrees to the U-shaped opening (708, 808, 908, 1008), a second radial arm slot (712b, 812b, 912b, 1012b) extending from the central portion at 180 degrees to the U-shaped opening (708, 808, 908, 1008), and a third radial arm slot (712c, 812c, 912c, 1012c) extending from the central portion at approximately 270 degrees from the U-shaped opening (708, 808, 908, 1008); and a second plurality of openings (714, 814, 914, 1014) not in communication with and positioned radially outward from the central opening and between adjacent radial arm slots in the first plurality of openings (712, 812, 912, 1012). a working end portion (702, 802, 902, 1002); and an opposite rear end portion (710, 810, 910, 1010) configured to be coupled to a plurality of different configurations of attachment mechanisms for oscillating power tools, the rear end portion including: a generally U-shaped opening (708, 808, 908, 1008) open to the rear end portion (710, 810, 910, 1010), the U-shaped opening (708, 808, 908, 1008) having a central portion configured to receive a central post of a tool clamping mechanism, and a rearward portion in communication with the central portion and open to the rear end portion of the (710, 810, 910, 1010) accessory; a first plurality of openings (712, 812, 912, 1012) in communication with and extending radially outward from the central opening, the first plurality of openings including a first radial arm slot (712a, 812a, 912a, 1012a) extending from the central portion at 90 degrees to the U-shaped opening (708, 808, 908, 1008), a second radial arm slot (712b, 812b, 912b, 1012b) extending from the central portion at 180 degrees to the U-shaped opening (708, 808, 908, 1008), and a third radial arm slot (712c, 812c, 912c, 1012c) extending from the central portion at approximately 270 degrees from the U-shaped opening (708, 808, 908, 1008); and a second plurality of openings (714, 814, 914, 1014) not in communication with and positioned radially outward from the central opening and between adjacent radial arm slots in the first plurality of openings (712, 812, 912, 1012). a generally U-shaped opening (708, 808, 908, 1008) open to the rear end portion (710, 810, 910, 1010), the U-shaped opening (708, 808, 908, 1008) having a central portion configured to receive a central post of a tool clamping mechanism, and a rearward portion in communication with the central portion and open to the rear end portion of the (710, 810, 910, 1010) accessory; a first plurality of openings (712, 812, 912, 1012) in communication with and extending radially outward from the central opening, the first plurality of openings including a first radial arm slot (712a, 812a, 912a, 1012a) extending from the central portion at 90 degrees to the U-shaped opening (708, 808, 908, 1008), a second radial arm slot (712b, 812b, 912b, 1012b) extending from the central portion at 180 degrees to the U-shaped opening (708, 808, 908, 1008), and a third radial arm slot (712c, 812c, 912c, 1012c) extending from the central portion at approximately 270 degrees from the U-shaped opening (708, 808, 908, 1008); and a second plurality of openings (714, 814, 914, 1014) not in communication with and positioned radially outward from the central opening and between adjacent radial arm slots in the first plurality of openings (712, 812, 912, 1012).