Radius Marker, Mini, 8 in Radius ORS NASCO and other special instructions Seal and and other special instructions Seal and protect your written message with a clear adhesive overlay Withstands moisture Quickly completes rough surface prep and debris removal tasks 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 the three smaller models will fit conveniently into a shirt pocket All have sturdy friction joints to maintain rigidity and accuracy