Straightaway Collection Lock Joint Bracket for Parallel Wall Mounting Across Upper Guide Channel Joints This double sidewall bracket is used when attaching two parallel upper guide channels to a wall and must be positioned every 24" - 35" (600 - 900 mm) center to center. This is a lock-joint type and should be used at every channel joint when mounting track to a soffit or ceiling. The Straightaway 400 Series is a bottom running system for interior or exterior sliding doors, and features simple installation with brass and steel construction. It has an upper guide with horizontal wheel and is suitable for a door up to 880 lbs. and up to 9' 10.125" height and 1.75" to 2.375" thick. Features: Made of galvanized steel Dual track sidewall mounting Lock joint type Specifications: Maximum door weight 880 lbs. (400 kg) For door thickness 1-3/4" (44 mm) Maximum door height: 11' 5.75" (3500 mm) Hafele is committed to finding better ways and it shows in their innovative and beautiful line of door hardware products. These products will lead to better organization and the peace of mind that comes with Hafele brand products. In addition to quality and beauty, Hafele is committed to reducing their environmental impact, so you can buy these products with confidence in every aspect.