Features:  1.Model: KYD007  2.Space Saving  3.Easy to assemble  4.Easy to use  5.User can according to needed, to choose sit, or choose to rely on and can be self-control    Specifications:  1.Name: Lift Up Hinge Spring  2.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).