Compass size hat measuring tool. 4 sizes are available. Suitable for most adult hats. The product is made of high-quality stainless steel, which is anti-oxidation and wear-resistant, high strength and high toughness. Hat making tool having ring design, highs quality metal and safe fastening for life-time using. With clear scales, accurate measurement. It has a compact size and rather light weight, so you can take it with you any time anywhere. Service: We place great emphasis on our customers' shopping experience. If you have any questions, please feel to contact us; we will respond to you within 24 hours!