Radius Marker, Mini, 8 in Radius ORS NASCO Coping type blade Full sized Coping type blade Full sized strain on neck muscles and improves productivity Absorptive protection is engineered into the window Not surface coated so the window will not lose its protective qualities the three smaller models will fit conveniently into a shirt pocket All have sturdy friction joints to maintain rigidity and accuracy Precision tools made of rust proof aluminum and anodized for lasting protection The arms are precisely aligned with spring tension joints to guarantee accuracy and rigidity The holder accommodates flat or round soapstone and pencils All are a folding type design