Slide-Co 16881 Bi-Fold Door Guide Rod, 5-5/8-Inch Bi-fold door top guide rod It is made in china 1/4 inch od Steel rod with 3/8 inch nylon cap 3/8in. O.D. nylon cap 1/4in. O.D. x 5-5/8in. steel pin Includes coil sing and sing retainer For steel frame bi-folding doors