Package included:1 Pair Lift Up Hinge SpringFeatures:1.Model: KYD0072.Space Saving3.Easy to assemble4.Easy to use5.User can according to needed, to choose sit, or choose to rely on and can be self-controlSpecifications:1.Name: Lift Up Hinge Spring2.Thickness of lift: 2.5mm and 4mm.3.Size: 17.2 x 22.7 x 24(cm)4.Angle range :(125 degree angle).5.Length of the bottom section: approx.17.2cm.6.Weight Capacity: it will hold between 100 and 200 lbs when it is opened.7.No instruction is included.Customers need to install it on your own.Note: Mounting Screws are included (If you do not use the screws in the package,you can choose to use your own bolts,or other screws whatever you think it is better for your projects,please measure the holes and estimate the length of the screws you need).