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160 mm Pushpin Strip Circle Compass
A flat 167 x 14 x 3 mm strip compass that draws true circles from 10 to 150 mm radius in 2.5 mm steps. Push a pin through the 2.2 mm pivot in the 12 mm finger hub, put a pencil or 0.5/0.7 mm mechanical pencil tip in any of the 57 staggered 2.4 mm holes and swing it round. Each hole sits at its exact radius even though the rows are offset ±3 mm. Edge notches mark every 10 mm, with deeper ones every 50 mm. It's a cheap, unbreakable stand-in for a bow compass that keeps slipping.
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