The business end of the Backbiter and the Ultimate all round indicator. Slide the weight up the arm to keep pressure on the line and tight to the lead at range or when fishing in flow or slide all the way back for when fishing visible floats. I have now made this my standard arm as it gives you the best possible bite alarm.The stainless steel ball line clip has adjustable tension and will register drop backs perfectly. The bobbin head will screw off so that an isotope or starlight can be added when night fishing. The Arm comes with a reflective orange sleeve that will go over the head for when fishing in daylight.