Catch Cover Hole Sleeves keep air drafts out of your fish house – keeping you warmer, your holes ice free, and saving you money by using less propane. They fit perfectly inside Catch Cover rings and are built using roto-mold construction, making them exceptionally durable. Available in either black or white. Black sleeves allow you to see down the holes better, while the white sleeves let more light into the house. Lifetime guarantee. These fish house hole sleeves fit neatly inside Catch Cover ice house hole covers and sit flush on the floor. 11 1/2" hole diameter, 13 3/4" overall diameter.