In Duncraft Selective Feeders the distance between the seed tube and the Havenguard fencing is too wide for squirrels to reach the seed. Selective feeders offer many small birds room to perch and feed at once. Selectives feature a Squirrel Lock tab, solid metal roof, and ports. Metal Selectives come with an Easy Clean base. Twist the seed riser at the bottom and pull out to allow free access for thorough cleaning to keep birds healthy. This one also offers a solid metal tray base for customers who want to keep their decks, patios and yards seed free. The tray collects discarded seed and seed husks. Lifetime Guarantee.