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The Wrist Ruler is a leather strap with engraved inch and centimeter dimensions. So you can also measure on the go at any time, eliminating the hassle of searching in your project bag. Sizes are based on wrapping around your wrist twice. Give it extra length depending on how loosely you want to wear it. Please allow an extra 1/2 inch for the stud closure. Wrist Ruler is made in the USA. lengths: 15 "- 38.1 cm 16 "- 40.64 cm 17 "- 43.18 cm