Micador Masterbow Compass | The Micador Masterbow Compass is ideal for use with technical and mathematic drawing to create perfect circles and arcs | Self centering and has a thumb wheel which allows you to make precise adjustments to ensure accuracy in your drafting | Ideal for use in mathematics, graphic design and engineering | Allows for micro adjustments to ensure accurate drawings | A useful drawing instrument in a handy plastic case | Central winder and adjustable point | Removable point | Spare leads included