Radius Marker, Small, 22 in Circumference no checkout with improved abrasion resistance Excellent comfort with improved abrasion resistance Excellent comfort and heavy duty use Strong tough tempered steel Nickel plated finish resists corrosion Scraper and file on outside of both blades Screw hinge permits adjustment 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