1.Healthier Choice: Table risers have four adjustable heights: 3.6' (92mm), 6.77' (172mm), 9.9' (252mm) and 13' (332mm). Use them to relieve back pain while working or to create a space for children and pets to play around the table or sofa 2.Easy to carry: This leg extenders for table is easy to fold and move. You can use it on desks or for cutting fabrics. It is also suitable for small parties, including those for teenagers and seniors. In addition, it is an excellent choice for outdoor activities, especially camping trips 3.: These folding table risers are made of high quality, heavy duty thick steel with electrophoresis black material that will not bend, rust or oxidize indoors or out! Save your money 4.Easy to install: Installation is a simple three-step process:1.Select the hole position with the appropriate height, insert the eyed bolt and lock it with the B-lock pin2.Place the table leg into the riser3.Tighten the reinforcement bdlts to fix the table leg 5.Package includes: These folding table extension legs include 8 table height risers, 8 eye bolts, and 8 type B locking pins