PROPORTIONAL SCALE DIVIDER: The 10 inches scale divider can be used to align your desired subject matter in the small end of the divider and transfer the spacing of the larger end to your drawing surface.This ensures drawings stay to scale to each other. CONVINIENT TO :Easy to . 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 you can keep the proportion on your drawing. DURABLE MTERIAL:Our scale divider is made of sturdy and light Plastic + Metal.Proportional dividers are , pocket-sized, and require no special electronics, so they are popular 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 it folds neatly and will slip easily into a backpack when you are out and about.This function is useful in many fields, including art, architecture and engineering, etc. PERFECT DRAWING OR TOOL:The scale divider tool is not only an essential tool for architects, but also an essential tool for art workers. And it is quite useful for people who are frequently paint or draw from a reference 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 the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.