Apex RB-1006-49 50' Carbon Steel Roof Rack Cargo Load Bars Cargo cross-bars designed to work with existing vehicle roof side rails (maximum 150 lb. capacity) Roof side rails must be from 1" to 1-7/8"W and between 38" to 49" apart Ensure the cross-bars are placed at least 28.5" apart for proper cargo balance Integrated turn-knob locking mechanism Carbon steel construction with a black paint finish Cargo cross-bars designed to work with existing vehicle roof side rails (maximum 150 lb. capacity) Roof side rails must be from 1" to 1-7/8"W and between 38" to 49" apart Ensure the cross-bars are placed at least 28.5" apart for proper cargo balance Integrated turn-knob locking mechanism Carbon steel construction with a black paint finish