3-7/8" X 7-3/4". 36 circles from 1/32" to 1-1/8". Permanent pin-point centering. CIRCLE SWINGER feature is a series of .046 pin holes which can be used to draw much larger circles, all the way to 14-3/8" diameter. Increments of 1/8" diameter are obtained by using different centers. Works with pencil or fine ball-point pen.
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