【Double Sliding Serving Window & Secure Lock】Features 4 screens on dual sliding rails for easy operation, plus an integrated handle and lock on the awning to deter theft and secure your food truck during transport or parking. 【Weatherproof & Superior Seal】Equipped with double waterproof strips for a tight seal, effectively keeping out rain and moisture in adverse conditions to protect your concession stand interior. 【Effortless 85° Awning Operation】Smoothly open the serving window awning up to an 85° angle with supportive pneumatic rods and hinges. An extra drag hook is included for convenient and easy closing. 【Durable Aluminum Alloy Construction】Made from high-quality aluminum alloy with a durable baking paint finish, this window is wear-resistant, rust-resistant, and built to withstand outdoor elements for long-lasting use. 【User-Friendly Protective Design】The sliding screens and protective awning offer added convenience by shielding against rain, sun, and unwanted intrusion while serving customers.