[9] A Florida-based company, Enviro-Holdings, LLC, operating under the trade name of One Design Composites signed a multi-year contract with W. D. Schock Corp in December 2018 to build the Harbor 20.

[1][2][10][11][12][13][14] The Harbor 20 is a recreational keelboat, built predominantly of fiberglass, with a small cuddy cabin in the bow and a large cockpit that can accommodate up to eight people.

[1][2][3][4] It has a fractional sloop rig, a raked stem, an angled transom, an internally mounted spade-type rudder controlled by a wooden tiller and a fixed fin keel with a weighted bulb.

[1][2] The boat may be fitted with an optional factory-supplied 24-volt electric motor for docking and maneuvering, that is stowed on a retractable stainless steel pivot arm in the stern lazarette.

[15][16] John Kretschmer described the Harbor 20, in a 2007 Sailing Magazine article, as, "a handsome daysailer ... [which] merged ease of handling, solid construction, exciting performance and traditional lines.