Aqua Medic overflow comb, for the construction of aquarium overflows. The water runs evenly through the comb. Plant debris and dirt are trapped, fish remain in the aquarium. The overflow comb is simply attached to the glass pane using the attached clips. The overflow comb can easily be removed for cleaning.Aqua Medic Overflow Comb with Clip 40 cmsuitable for glass thickness 10 - 12 mmlength: app. 40 cmheight: app. 5.5 cmlength of teeth: app. 3.7 cmAqua Medic Overflow Comb with Clip 50 cmsuitable for glass thickness 6 - 8 mmlength: app. 50 cmheight: app. 5.5 cmlength of teeth: app. 3.7 cm