Stainless steel rust free chimney cap with removable top to inspect and clean chimney. This cap will last a lifetime. Bottom measures 20"x38" with hinged mounting flange to fit chimney cap perfectly. Top measures 11"x22"x40". Keep squirrels; birds; bats; rain; leaves out. Attaches with silicone caulking and/or tapcon screws. In excellent condition will never rust and will not build up creosote. Selling due to removing fireplace with double flue replaced with single flue. This model sells for $175-$225 and looks like new on your chimney.