Abstract: A mandrel and accessory and related combination for use with a rotary tool are disclosed. For instance, the mandrel and accessory combination includes a mandrel assembly and an accessory. The mandrel assembly includes (i) a shaft component defining an axis and having a first portion configured to be received in a chuck of a power tool, and a second portion having a first shaft tooth and a second shaft tooth each extending in a perpendicular manner with respect to the axis, and (ii) a collar component defining a passage through which the shaft component extends, the collar component having a first collar tooth and a second collar tooth. The accessory includes an outer wall structure defining a circular outer periphery; and an inner wall structure defining a coupling opening. The accessory is configured to be releasably coupled to the mandrel assembly.