This Nocqua Shaft Battery Mount is designed to allow you to attach the Nocqua battery to any shaft that is 25mm – 35mm (1 inch to 1 3/5 inches). The battery is easily installed by routing the velcro strap through the two slots and clamping the strap on the existing velcro. The mounting bracket is made with extra wide sides to allow you to easily pull the battery and mount on and off the tube that its mounted to.