Uxcell Folding Bracket 6 inch for Table Desk Wall Mounted Support Collapsible Long Release Arm Carbon Steel Black 2pcs 1. Folding track is flexible and smooth, edges are finely polished, no burrs. Parallel bar struts, connected by thick rivets, tight and not loose, durable. 2. Fold button is easy to press, shrink simple, flexible and convenient, does not take up space. 3. Triangle shape is the construction in wall brackets currently. Enough to be used as Bookshelf, Kitchen shelf, Exhibition Stan