Slide rail life: YENUO slide rail opening and closing test 100000 times. The service life is 30 years. Installation requirements: the installation space on both sides of the drawer must be 19mm 20.742. Length: 18-inch 450mm Suitable for long cabinet depths of 18-20 inches. Lockable detachable: Featuring Lock Design. Prevent from sliding. Easy control and secure fixation. Separable interior slide removal of the drawer possible after having removed the blocking Heavy-duty slide :3-Fold Full Extension opening allows for the entire drawer to be accessed. Attention: the mounting brackets and screws are not included Professional application: Goods shelf Cabinets Industry-used drawer RV Truck Vending machine heavy drawer. etc. YENUO heavy lockable slide Featuring Lock Design. Prevent from sliding. Easy control and secure fixation. Technical details: 1. Very sturdy version-high gloss galvanized metal. 2. The drawer slides with ball bearings for smooth quiet opening and closing 3. Fully cover to prevent the drawer from sliding out when fully opened. 4. Separable interior slide removal of the drawer possible after having removed the blocking Material: Cold rolled steel Lock handle length: about 3-4 cm Height: 53 mm Width: 19 mm Bearing weight: 113kg / 250 lb Material thickness: 2 2 2 mm The length shown refers to the closed state of the drawer slide. The extended length is twice the closed length. Note: Mounting brackets and screws are not included. How to choose the size Measure the depth of the draw 17 inches /431.8 mm choose 16 inches / 504 mm drawer slides. Deviations of 0.7 inches / 20 mm-1 inches / 30 mm are appropriate