The Poison Spyder Trail Cage is designed for those Jeep TJ and LJ owners who already have the factory roll bar, and would like to add on to it to form a full roll cage rather than installing a complete new cage. The Trail Cage kit is an eight piece set. It comes with two Lower A-Pillars (dash to floor supports) and two tubular Upper A-pillars that are to be welded to the factory windshield bars. Also included are a dash bar, upper windshield bar, and two center spreaders that can be located in several positions. The Poison Spyder Trail Cage kit comes disassembled and requires welding to install. The Lower A-Pillar is designed to provide a strong foundation for the forward section of the cage while not intruding into the dash or compromising legroom. The Trail Cage is secured at the windshield, at the front gusseted A-Pillar, at factory mounts on the door jamb and to the floor through the forward drain hole. This provides solid strength from the top of the windshield to the floor. The Lower A-Pillars and gussets are CNC laser cut and precision brake-formed for quality and fit. Tubular kit components are constructed from 1.75" .120 wall DOM structural tubing. All tubular components are CNC-bent and laser-notched for a precise fit, and laser-marked with reference numbers for easy identification and installation. You may want to consider also purchasing the Heavy Duty Header Bar Kit to replace the weak and thin wall tubing factory header bars. The Poison Spyder Heavy Duty Header Bar Kit part number is #PSC14-18-030.