Precise 1-2-3 Blocks Set with Single Hole – 3402-0054

• Ultra Precision.
• For precision grinding, layouts, etc.
• Drilled hole size is .500 -.501.
• Accuracy with squareness on all sides within .0001 per inch.
• Hardened to RC 58-60 and ground to surface finish from 6 to 10 micron inches.
• Overall dimensions are 1 X 2 X 3″.
• Sold as a matched pair.