All are a folding type design, the three smaller models will fit convenientlyto a shirt pocket.
All have sturdy friction joints to maintain rigidity and accuracy.
Size Group: Standard.
Radius: 24 (Max).
Material: Aluminum.
Standard Radius Marker:. All are a folding type design, the three smaller models will fit conveniently"to a shirt pocket. All have sturdy friction joints to maintain rigidity and accuracy. Size Group: Standard. Radius: 24" (Max). Material: Aluminum. Includes: Soapstone Crayon.