BaseQi Aluminum Dust Plugs (iHUT) for MacBook Pro Retina 13" & 15" For MacBook Pro Retina 13" and 15" Use aluminum material and each one is CNC precision machining. Toolless : When you remove without any tools iHUT is a set of 5 aluminum dust plugs designed to cover up your HDMI, USB & Thunderbolt ports They will fit perfectly into your Macbook without any protrusions.