The tape measure has a square hole in the head, which is convenient to when not in use, easy for card position during measurement, and the reading is more accurate. of high-quality material, durable, safe and not easy to . ruler is used to measure and head circumference. Perfect head circumference tape measure for babies, infants, children.And can be used to measure the circumference of various cylindrical objects, such as water cups, bottles, baby hats, etc. White ruler with black scale, easy to use and measure., Manufacturer: Kalttoy