PROPORTIONAL SCALE DIVIDER: The 10 inches scale divider can be used to align your subject matter in the small end of the divider and transfer the spacing of the larger end to your drawing surface.This ensures that stay to scale to each other. CONVINIENT TO USE:Easy to use. Increase, decrease or measure the size of a subject to draw. The scale divider drawing tool is 10 inch x 0.5 inch x 0.25 inch.There is a locking device so that you can keep the same proportion on your drawing. DURABLE MTERIAL: scale divider is made of sturdy and light Plastic + Metal.Proportional dividers are accurate, pocket-sized, and require no electronics, so they are tools in these fields. WIDE APPLICABILITY:This practical drawing tool allows you to scale your pictures in ratios from 5:1 to 1:5. When not in use it folds and will into a backpack when you are .This function is useful in many fields, including art, architecture and engineering, etc. PERFECT DRAWING OR PAINTING TOOL:The scale divider tool is not only an tool for architects, also an tool for art workers. And it is quite useful for that people who are frequently paint or draw from a reference that requires size reduction or enlargement. Colour:As shown Material:Plastic + Metal Package Contents: 1 * Proportional scale divider set Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.