A terrific Fenton Milk Glass Hobnail Ashtray. The Fenton Milk Glass Hobnail Ashtray is in an Octagon Shape and has 4 slots for cigarettes. The top and inside are smooth and the sides and bottom are all Hobnail. It is unmarked and measures 4 1/4 inches across and stands 1 1/4 inches tall. There are no chips or cracks.