Tenmat, 1 Hour UL Fire Rated Lighting Cover, Dimensions: Inside: 7.375&rdquo;H x 13&rdquo; Diameter Overall: 8&rdquo;H x 14.25&rdquo; Diameter, Material: Intumescent Material, Color: Black, Qty: 1 Easy to install Significant labor savings Flexible material enables cover to be fitted around obstructions or retrofitted In a fire, the intumescent material expands 5 times of its original thickness, closing the vent holes and preventing flame spread Easy to remove and reinstall for fixture maintenance