This SPI steel 1-2-3 Block set includes a matched pair of 1-inch x 2-inch x 3-inch blocks, socket head cap screws, and a hex key
Squareness of all sides is within 0.0001 per inch
Constructed of hardened steel with 45-50 HRC Hardness
There are a total of 23 holes: 5 tapped (3/8-16) holes and 18 un-tapped (3/8") holes for easy clamping
Description
This SPI steel 1-2-3 Block set includes a matched pair of 1-inch x 2-inch x 3-inch blocks, socket head cap screws, and a hex key. Each block has a 50 HRC hardness with 0.0001-inch squareness. There are a total of 23 holes: 5 tapped (3/8-16) holes and 18 un-tapped holes for easy clamping.