The Nautical solid brass divider is a great addition to any desktop. It is handcrafted from solid brass. This proportional divider is a reproduction crafted in the style of a century ago. The proportional divider is not your average perspective tool! It is perfect for artists who frequently paint or draw from a reference that requires size reduction or enlargement. This divider is perfect for Getting proportions and perspective correct in a drawing or painting, Portraits, landscapes, and still-life’s, Enlarging or reducing the size of a reference by hand, Artists of all skill levels, architects and drafters, to Increase, decrease or measure the size of a subject to draw. This brass divider comes with beautiful blue colored leather case for easy carry which will also more attractive and sure you will get praises from your friends while using this divider. By using this protective case you can retain this traditional divider for many years. This divider is must have in your engineering kit. Its durable, brass construction ensures that artists will be enjoying the proportional divider's incredible accuracy. Changing the size of the proportional measurement is easy, just loosen dial by rotating the screw and slide up and down to shrink or enlarge the scale. To change the proportions, you need to loosen the dial by moving it up and down it will loosen easily. Once you have in desired position for your sizing, tighten the dial.