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Big bow should usually be equipped with heavy arrows to balance the flight trajectory. Due to strong impact especially in cold winters, it’s easy for the insert part to slip off the arrow shaft. Our product adopts the design of uneven surface and thread to increase the friction and adhesion between copper bolt surface and inner diameter of carbon arrow, which can perfectly solve the problem of falling off. Meanwhile, it’s easy to break into two sections with 20 grain each so as to easily combined to fit for the bow weight required such as 120grain, 100grain or 80grain. Multiple sizes for selection: .267.279.291.299.311. You can choose the matching size according to carbon arrow diameter.