Description: 5'' gauge designed for winding circular ducts and many objects, for fitting tiles, laminate, carpet, checking dimensions, moulding, etc. Easy to use, against whatever you're trying to trace. Using the ruler for a period of time, you can easily adjust the tightness; Once object has been contoured, lock gauge in place for traces every time. Made of ABS high strength, anti-rust. High accuracy clear enough, easy and comfortable to read. Suit for metal, stainless steel or any duplication work. For Irregular objects: Gauge can be used to measure the shape of irregular objects. Specification: Type: Irregular Gauge Material: ABS Color: Orange Dimensions: 5 inches Package Includes: 1 Piece  Gauge Note: Please allow 1-3cm (0.4-1.18") difference due to manual measurement. Thank you for your understanding.