Material: high quality steel, clear scale and ruler, it is more convenient to use measurement. Double-sided and thickening good for a long time. 3Pcs value: This set includes 1pcs 15cm/6inch ruler, 1pcs 20cm/8inch ruler, 30pcs/12inch ruler, suitable for different measurement work. Foldable steel ruler: soft and very flexible, good for use durable.The marks are a little recessed in the metal, so that they won't fade over time. Universal ruler with hole: the surface of the rulers is smooth, no burr;One end is square, the other is rounded with a hole for easy hanging. Scope of use: Suitable for use in a variety of locations, such as office, construction, computer. Specification: --Stainless Steel Ruler Metal Ruler, 6inch, 8inch, 12inch. --The hole on the half round end allow you to hang it to the peg board directly, it would be nice to put decimal equivalents for common sizes. --Made of durable stainless steel, great material for your long time use; Office ruler are engraved with markings so that they will not rub off over time. Metric/inch: Conversion table on the back is convenient to convert inch into millimeter, being a good helper for conversion between inch with metric. Applications: Stainless steel rulers in different lengths are handy for a variety of applications, use them for office, school, drawing, engineering and other tasks. Features: Material: stainless steel Color: Silver Size: 15cm(6 inch)/ 20cm(8 inch)/ 30cm(12 inch) Quantity: 3 Piece Package: 1* 15cm Steel Ruler 1* 20cm Steel Ruler 1* 30cm Steel Ruler