DesignRail Kit (QCS) Quick Connect Stair Post Kits by Feeney are termination posts used to begin a cable section and are to be positioned at the bottom of the stairs, or stair the stair run at the top of the stairs. Use with Threaded Terminal Stair or Level, and DesignRail Stair Rail Kits. Use QC side of CableRail Kits with Quick-Connect Posts. Quick Connect fittings are the non-tensioning. Stair angle must be between 29 and 34 degrees. Visit DesignRail Kits Page for literature and installation. Available for 36" Railing only.