For irregular things: this design is designed for measuring irregular items, you don' need to use the normal ruler and worried about the inaccurate measuring, with this profile gauge, you can replicate the shape and match the cut outs to get a precise measuring Practical tool: it much time and energy to mark the precise tile cut, or measure winding pipes, circular frames, ducts and more, useful tools to operate most kinds of modelling Material: it is made of ABS plastic, sturdy material for long time using; Notice: this product is a little weighty, please be careful when using to avoid unnecessary hurt Size: this multi-functional contour profile gauge is 28.3 x 10 cm/ 11 x 3.9 inch, and the ruler is 25 cm/ 10 inch long in scale, size mark on both sides, available on both sides Color:green Material:ABS Size: 28.3 x 10cm Package Contents: 1 x Contour profile gauge Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.