Upgrade an existing staircase with easy to install Stairs Parts from STAIRS & IRON Do Your Stairs Yourself...Wrought Iron Stair Baluster Installation is Easy!!! we cut METAL BALUSTERS to the sizes ( existing wood spindles ) . Ready to install . if You have metal bar under your railing ? No problem we will cut tap ( screw thread and tap) so , take the old ones out and put the new ones