2 PC 1-2-3 Metal Blocks NO Holes Milling Drilling Machining Precision Block 2 PC 1-2-3 metal blocks with NO HOLES ; Size: 1 x 2 x 3" ;Size within +/- .0002" Flatness and parallelism within .0002" ; Squareness on all sides is 0.0003" per inch Made of hardened tool steel and precision ground on all six sides Pairs are matched to a tolerance of 0.0002";Heat treat and hardness 56 to 60 RC Quantity: 1 ( 2 pc per order) ; Unit weight: 3.40 lb (total for 2 pc)