uxcell Plastic LED Strip Light End Cap Cover w 2 Holes 5 Pcs 12mm Width They are commonly used to re-seal LED strips after cutting or resizing them. White design helps give it a hidden "invisible" look while not obstructing light from the strip. Size : 15 x 6 x 10mm/ 0.6" x 0.24" x 0.39"(L*W*T);Interior Width : 12mm These silicone end caps are used for re-sealing LED strip lights that have been cut to a custom length. Only high end LED and advanced optical design are adopted.