This is the largest of our popular side-mount brackets for attaching pickets and spindles to the side of a staircase. We recommend using two of these brackets per stair tread. Placement and spacing should depend on your baluster design and local building code (e.g. 4″ gap requirement). Each bracket includes a round flange with 3/8″ thread. For smaller versions, check out our P1647 bracket available in malleable iron (unfinished), stainless steel (polished or brushed satin), and brass. As noted below, this bracket is unfinished malleable iron, and should be finished using paint, lacquer, or powder-coat.