All parts made of hardened tool steel and ground to highest accuracy. Squareness and parallelism are within .0002" per 5". Many 3/8"-16 tapped holes to facilitate clamping. One end rail. .200" step built into gage block roll so that gage blocks over .200" can be used to set very small angles. 5" & 10" distance between center rolls is accurate within .0002". Two offset hinges for added stability.
