These billet polished aluminum column drops fit Speedway Nostalgia columns, Hot Rod columns, our stainless steel columns, or your custom 1-3/4" O.D. column. Mount hole spacing is 2-7/8". For these swinger style drops, the underdash nuts & bolts are included. Each swinger drop has two hex screws on either side that when unscrewed will detach the lower half of the mount to slide your column through. A hinge at the upper end allows multiple choices of mounting angles. 1-3/4 Inch diameter hole. 3-1/2 Inch drop. 2-7/8" mount hole spacing. Two screws on either side will detach to slide your column through. Polished aluminum construction. Nuts & bolts are included. Note: Column drop lengths are measured from the centerline of the column to the column drop mount surface.