Celco circle templates are made from a flexible clear plastic and range from 20 to 36 circle sizes. This product is a must have for any one in technical or architectural design.
#C67 Circle Template - 20 circles 3mm to 28mm diameters, milimetre and inch rulers.
#C68 Circle Template - 36 circles 1mm to 36mm diameters, Ink boss risers for use with ink pens.
*image shows C68