Attributes . 1 Block 1.0005 mm; 1 Block 0.5 mm; 9 Blocks 1.001"-1.009" by 0.001 mm; 49 Blocks 1.01"-1.49" by 0.01 mm; 48 Blocks 1.0"-24.5" by 0.5 mm; 4 Blocks 25.0"-100.0" by 25.0 mm . Names