SPI 2-inch x 4-inch x 6-inch setup blocks are sold as a matched and measured pair
5 tapped holes (5/8-11) and 18 (5/8 inch) untapped holes
Ground to surface finish of 6-16 microinches with a hardness of HRC 55-60
Includes protective storage case
These setup blocks are a precise larger version of more-common 1-2-3 blocks. With the larger size comes increased weight. This pair of 2-4-6 blocks weighs 25 lbs.