Hoffman DGTB420, Ground Bar Kit, Telco, 4.00x20.00x.25, CopperHoffman DGTB420 Ground Bar Kit, Telco, 4.00x20.00x.25, Copper. Product Specifications BRANDHoffman® MANUFACTURERS PART NUMBERDGTB420 CONSTRUCTIONCopper DESCRIPTIONTelecommunications Ground Bar Kits NO. OF 5/16-IN. HOLE SETS24 NO. OF 7/16-IN. HOLE SETS6 BAR SIZE INCHES4.00 x 20.00 x .25 BAR SIZE MM102 x 508 x 6