The Vantech H1 aluminum 3 bar system can hold up 750 lbs. The Crossbars is 2" X 1" reinforced extruded aluminum with built-in channels. The aluminum mounting upright is approx. 1/8" thick at the base. The mounting uprights are 8in wide at the base and 10.25" total height. The Base is welded complete onto the upright post for complete seal. There are 4 x 1in eyehook per mounting upright There is absolutely No drilling required, secures with drip rail clamps. The drip rail clamps are 11 gauge galvanized steel/powder coated 2" X 8" dipped in rubber top and bottom. Rubber cap on the upright post prevents wind noise and water leakage. The system Includes 5" ladder stopper to prevent ladder from sliding forward, Ladder stoppers are galvanized and rubber dipped. The system also includes 5.5" ladder guide for easy bungee and tie-down. Ladder guide are galvanized and rubber dipped. Easy turn knob allows quick adjustments and removal of ladder stopper and ladder guide. hook & loop straps secure ladders within seconds up to 75 lbs.