SPECIALLY DESIGNED FOR DROP LEAF: The hinge will work perfectly if your drop leaf weighs less than 22lbs. It is not used for supporting lid or keeping it stay STURDY GAS SPRING: Pressure: 100N/22lb. Suitable for: 16-22lb drop leaf. Made of solid brass and iron, sturdy gas spring helps to lower the lid softly and close it easily. With Chrome plated, it is durable and corrosion-resistant SOFT DROP-DOWN: It is designed to damper the drop-down rate of a drop leaf, such as that of cupboard, cabinet and shoebox, and prevent quick and dangerous closure EXTEND AUTOMATICALLY: Overall length: 7.9in (compressed) to 11.4in (stretched). Travel-3.5in. The space-saving hinge will extend automatically as you pull the lid open, and will not get in the way EASY TO INSTALL by following the instructions Quantity2pcs