Material:  Steel with smooth black semi-gloss finish Printed RU increments to aid equipment mounting Mounting hardware Sold in pairs Spec Sheet:  2443-RRN44 TAA Compliant Certified U.S. Steel Made in U.S.A. (BAA) Additional mounting rails shall be Lowell Model No. RRN-44, which shall be steel with a black powder epoxy finish and printed scale showing rack unit increments. Rails shall be tapped on one side to accept threaded 10- 32 screws. Each rail shall measure 44 rack units. Mounting hardware shall be included. Rack Screws: RSP Series: Phillips Finish-head, 5.1 hardness, 10-32 x .875 RSM Series: Phillips Truss-head, 302 stainless steel, 10-32 x .75 RS Series: Phillips Truss-head, 10-32 x .75 RSV Series: Torx star post head, 10-32 x .875 RSR Series: Robertson square head, 10-32 x .875