SPI Top Quality 1-2-3, 2-3-4 & 2-4-6 Block Sets

• Supplied in Matched Pairs.
• Precision ground and case hardened on all six sides.
• Ideal for precision set up and layout work. Hardness: 56 – 60 RC.
• Feature 23 holes: 5 are tapped 3⁄8 – 16, the other 18 are untapped.