Buy White Limestone Fireplace Mantel from Wilshire Fireplace Shops San Diego; Also available in optional sizes – Please enquire for details Shown with the Universal fire basket for dogs, Spherical steel dogs and limestone hearth and slips. Opening 48” W x 40” H Shelf 68” L x 8 5/8” D Overall size 62 1/8” W x 48 3/8” H Depth of jamb 5 1/2” Height of footblock 4”.