Interchangeable tool attachment and system

An outdoor power tool comprising:

• a motor positioned within a power head and configured to rotate a transmission shaft positioned within an elongated stem;
• a drive shaft rotatable about a drive axis in response to rotation of the transmission shaft;
• a coupler mounted to the drive shaft for relative co-rotation therewith;
• and
• a cutter configured for relative free rotation with the drive shaft, the cutter attachable with the coupler by a fastener for relative co-rotation with the coupler;
• wherein the cutter includes a raised boss portion extending from the cutter in a first direction parallel to the drive axis and a depressed portion extending into the cutter in a second direction parallel to the drive axis and generally opposite the first direction;
• and
• wherein the raised boss portion and the depressed portion provide a clearance between an outer radial surface of the coupler and a side wall formed by the raised boss portion and the depressed portion.

An outdoor power tool configured to be selectively attached to a power head, the outdoor power tool comprising:

• an elongated stem including a first end and a second end opposite the first end, the elongated stem supporting a projection adjacent at least one of the first end and the second end;
• a tool attachment unit supported on the first end of the elongated stem;
• and
• a storage attachment removably coupled to a second end of the elongated stem;
• wherein the storage attachment includes a bayonet slot engageable with the projection such that the storage attachment is moveable between a first position in which the storage attachment is locked to the elongated stem and a second position in which the storage attachment is removable from the elongated stem;
• and
• wherein the storage attachment is configured to support the outdoor power tool while in the first position.