*Key Features *4 Universal Sizes: Available in 16", 24", 32", and 40" sizes, compatible with a variety of mainstream drawer slides, allowing for flexible replacement and use. These sizes cater to different cabinet needs, ensuring a perfect fit for a wide range of home and office applications *Installation Guide: Before installation, please reserve enough height between the side cabinet bottom and the drawer to ensure smooth installation of the ladder cabinet slide rails. Also, ensure that the selected slide rail length is less than or equal to the cabinet body length *260lbs Dynamic Load Capacity: After 10,000 dynamic load tests, the 260lbs load-bearing capacity design with galvanized steel plate ensures corrosion resistance and rust prevention. Designed for quality, creating a functional and efficient living space *3-Stage Full Extension: The 3-stage full-extension drawer design allows easy access and visibility. Compared to 2-stage slides, it completely eliminates blind spots, offering more convenience and ease of use *Silent Opening and Closing: Equipped with a silencer at the end to reduce noise during opening and closing. The high-quality spring and steel ball bearings ensure smooth sliding and seamless, stable closure *Specifications Item Model Number: 4801.800.BK Material: Carbon Steel Item Size: 31.5 x 2.95 x 2.17 inch / 800 x 75 x 55 mm Net Weight: 18.52 lbs / 8.4 kg Color: Black Quantity: 1 Pair Weight Capacity: 260 lbs / 117 kg *Package Content Under Stair Drawer Slides x 1 Pair ST4 x 16 Self-tapping Screws x 24 User Manual x 1