The Double Bob rail provides for a convenient and secure means of attaching a Hailong-03 Downtube battery to any any location on the bicycle frame tubing regardless of the eyelet position. These pieces are CNC machined from solid aluminum stock and provide a wide and flat platform for the battery cradle to rest, so there is none of the rocking or play that is sometimes present with waterbottle eyelets. Machined channels allow up to 3 hose clamps to keep the battery tightly in place. Designed and made in Canada by Grin Tech.