Features: This list is for a compass size ring hat measuring tool. 4 sizes: small/medium/large/super large, Fits most adults' hats. Headwear tools are essential for hats manufacturing business as hat making tool and sizer- tool. Thanks to this manual hat ruler you can measure the inside length of the hat finding inch-centimeters scale in front of you. Made of durable metal materials, smooth and bright. Specifications: Material: Metal Size: approx 18x18x5cm/7.1x7.1x2in Type: small/medium/large/super large Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Hat Ruler