Package Include: 20pcs (+ 40 Screws). soft silicone mounting bracket safely and securely hold your LED Strip Light. These little gadgets will make your work so much easier and makes your LED installation look more professional. They ensure long term fixing, especially on rough say timbers or concretes. Invisible design, The clear silicone helps give it that hidden "invisible" look while not obstructing light from the strip, simple to use. Moreover, it is also recommended to place this silicone bracket in and between two LED chips. Bracket never split or broke as well as each one worked very well. INSTALLATION: Simply use two small screws (one on each side) for hardware. They are holding up the LED strips well thanks to soft/pliable material, so they will not damage the strip. Hollow distance 13mm/0.5 inch (strips width less than 0.5 inch). Hollow height: 4mm/0.16inch.