Prime-Line Ball Bearing Tandem Roller Assembly D 1980

This is a unique tandem roller assembly with two 1-1/4 in. concave steel ball bearing rollers installed. The square shaped housing is 11/16 in. wide, 1-1/2 in. tall and 4-1/2 in. long. It has an end adjustment screw and two mounting tabs at each end of the housing. When the housing is inserted into the mortised area in the bottom rail, screws are used to fasten it in place.