PATENTED STEEL CONSTRUCTION DRILL-LESS DESIGN - Our bracket support eliminates drilling into your window sill completely making for an easy, drill free installation. ADAPTS TO ANY WINDOW STYLE - The AC Bracket works with a wall thickness of 3" to 12" and works for window openings that are 27-38 inches wide. SAFE, DURABLE & CONVENIENT - Dual AC brackets relieves the stress on the window and holds well over 200lbs with simple installation from inside your window. WORKS WITH ALL BRAND NAME AIR CONDITIONERS - All necessary air conditioner mounting bracket hardware is included & works with all brand name air conditioners. WINDOW SILL PROTECTION – Sturdy and strong support that will prevent damage to your window sill and wall by removing the pressure and weight of an air conditioning unit.