318923
Triangular reduction scale - 3/32, 1/8, 3/16, 1/4, 3/8, 1/2, 3/4,1,1-1/2, 3, 16 12 in
318931
Triangular reduction scale - 10, 20, 30, 40, 50, 60: inch 12 in
318949
Triangular Reduction Scale - 1:100, 1:200, 1:250, 1:300, 1:400, 1:500 30 cm metric