The first magSlide we are launching is a large, however because of the four contoured ribs (comfort grooves) that run vertically on the inside of the slide, you will have a tighter fit and more control that if it was just a round tube.
The inside dimensions shown are from the tops of the opposing ribs and also valley to valley which is the widest, ,740" diameter. See the 2D CAD drawings in the photo gallery.
outside diameter: 1.149
inside diameter: .680"-740"