The waterbottle drill jig is a real time saver. It can be used freehand on a drill press to accurately and quickly drill waterbottle or breather holes in your tubes. Carbide drill bushings guarantee proper hole location and spacing, while a dummy BB is used to locate miter and ensure holes are on centerline of frame. Drilling holes while frame is apart also allows for easy chip removal from tube. No more having to try and shake the rattle out of a bike. BB30 and PF30 bottom brackets are also available.