For stretching elastics and strip rubber in elasticized items or for retarding tapes and laces in order to create shirring or fullness. Tensions are generally used in conjuction with some form of folding attachment (foot or guide). Double spring construction for equalized tension. Table type fastens to either top, front or underside of the machine table. Adjustable to any width up to 2-1/2". Built-in separating clips convert tension into tape guide.