Beam Compass / Trammel, Adjustable Circle Drawing Tool for Large Diameters (tramel)

3d puzzle tool holder pen art diy geometry circle gear kid fun education gadget accessory marking adapter woodworking penholder tools construction drawing ink 3dprint compass arc circletemplate muji carpenter circles rotring compasses trammel auxiliary zirkel zirkelhalter scribe drawingstraws yardstick beamcompass adjustmentcompass largecompass bridgecompass stangenzirkel emkatech adjustablecircletool largecircles precisiontool rodcompass tramel 3d puzzle tool holder pen art diy geometry circle gear kid fun education gadget accessory marking adapter woodworking penholder tools construction drawing ink 3dprint compass arc circletemplate muji carpenter circles rotring compasses trammel auxiliary zirkel zirkelhalter scribe drawingstraws yardstick beamcompass adjustmentcompass largecompass bridgecompass stangenzirkel emkatech adjustablecircletool largecircles precisiontool rodcompass tramel