Precise 1-2-3 Precision Matched Pair Block Set – 3402-0005

• Heat treated and case hardened to HRC 55 to 60.
• Hardened and precision ground on all 6 sides of each block.
• Accuracy with squareness on all sides within .0002″ per inch.
• 23 holes consists of 5 tapped holes that are 3/8″-16 for clamping and 18 untapped holes.
• Cross drilling design gives minimum weight and maximum strength.