This is a paper cone used for winding and holding industrial thread. Length: 180 mm Small Diameter Outer Diameter: Φ28 mm Small Diameter Inner Diameter: Φ17 mm Large Diameter Outer Diameter: Φ49 mm Large Diameter Inner Diameter: Φ46 mm ※Please be careful not to mistake this for a similar product with a length of 175 mm. ※Measurements are approximate. ※A label is generally affixed to the inside. ※Generally, there is a notch in the large diameter section for holding the thread. ※Thread scraps may be attached.