After careful measurement, the three small grooves can smoothly place the cigarettes, the grooves are round and smooth, and easy to use. The ashtray has lid and its' container is deep and large enough to store many cigarette butts and keeping ash inside. Isolate the smell of cigarette butts. Whatever put it on patio table, back porch table, outdoor covered balcony or on your coffee table, it's eye catching, also match your interior decor This a great outdoor ashtray with lid, it doesn't be blown way even in high winds. material is sturdy and durable, no need to worry about unextinguished cigarettes catching fire or ashtrays rusting in the rain. Easy to install.