2 4 6 Wooden Building Blocks Set - STEM Educational Toys for Kids - Perfect for Preschool Learning, Creative Play & Home Schooling (Great for Birthday Gifts, Classroom Activities & Montessori Education)

Matched Pair - Import

Precision ground and hardened on all sides

• Blocks are matched within .0002" and measure 2" x 4" x 6"
• Squareness: .0001"
• Parallelism: .0003"
• Hardness: 55-60 HRC
• Flatness: .0001"
• 5/8" - 11 tapped holes
• 23 holes on each block