Harris Engineering Number 2 Flange Nut. OpticsPlanet Inc is an Authorized US Distributor for Harris Engineering Bipods. Hollow forend. Allows mounting of stud on hollow plastic forends. Flange is 5/8 inch wide by 1 3/8 inch long. Package Contents: Harris Engineering Number Flange Nut 2 We offer the complete line of Harris Engineering Bipods. For our complete selection of products by Harris Engineering on sale please visit our Harris Engineering page. For more Bipod Accesories please visit our Bipod Accesories store section. Harris Engineering Number 2 Flange Nut