Use as a heat shield on structures with vinyl siding, or other temperature sensitive materials, to help prevent warping and or melting of the material. Use only on horizontal terminations and on any irregular surfaced siding (ie: ship lag siding, shake shingle siding) so cap is not imbedded in the siding. Sized for Sconce Cap, Round Horizontal Cap and H2 Horizontal Cap only. Factory assembled. Use for 4”x 6 5⁄8” and 5”x 8” diameters.