The Jensen 066016 is a genuine OEM tension spring specifically designed for the feed roller mechanism in various Jensen wood chippers. This essential component ensures proper tension for efficient material feeding and optimal performance. It is compatible with a wide range of Jensen chipper models, including the A321, A340, A425, A530, A540, A540XL, A540XL-R, A540XL-R-K, A540XL-R-Z, A540XL-Z, A540-Z, A540-R, A540-R-K, A540-R-Z, A540-Z, A550, A550XL, A550XL-R, A550XL-R-K, A550XL-R-Z, A550XL-Z, A550-Z, A550-R, A550-R-K, A550-R-Z, and A550-Z models.