Additional Details ------------------------------ Product description: Our counterweights -- compatible with our "counterweight-ready" Equinox shafts, are designed to help balance out the nose-heaviness of the unit, for better ergonomic comfort. These tubes screw into a threaded insert in the end of our "counterweight-ready" upper shafts, for easy installation and removal, and they also include a threaded cap on the end of the tube. The removable cap permits the amount of weight in the tube to be adjusted easily, to account for different coil weights, different conditions, or simply user preference. The tubes are custom-built for each user, at whatever length (and weight capacity) is preferred.