I've got a new set of 47-53 blocks here and they measure: - 2 inches tall (height)
- 2 1/4 inches long (side)
- 1 3/4 wide (end)

- 2 of the blocks have holes directly i through the middle.
- 2 of the blocks have the hole 3/4 of an inch over on the 2 1/4 inch side.

hope that helps.