LEDENET 18mm Width Silicone Waterproof Double Row LED Strip Lights End Cap Cover W 4 Hole LED Strip Light End Cap Cover. Interior Width : 18mm. External Size : 19*5*10 mm (L*W*T) Material: Silicone. Color : White Package included: 5pcs 18mm wide end cap (no hole), 5pcs 18mm wide end cap (4 holes), 1pc LEDENET microfiber cleaning cloth