2 4 6 Blocks Matched Pair (2) 23 Holes - Precision Wooden Building Blocks for Kids STEM Learning, Educational Toys for Toddlers - Perfect for Classroom, Playroom & Homeschool Activities

2-4-6 blocks are used for machine set up, layout, and inspection.

• Contains 23 5/8" through holes (5 holes tapped with 5/8" x 11 TPI threads and 18 untapped)
• Made of hardened tool steel (RC 55-62)
• Precision ground on all six sides
• Overall size within +/- 0.0003"
• Flatness and parallelism within 0.0003"
• Squareness on all sides to within 0.0003"
• Pairs are matched to a tolerance of 0.0002"
• Two (2) pieces per set

WARNING: Cancer and Reproductive Harm -