Fowler 0.0003 Squareness Per Inch, Hardened Steel, 1-2-3 Block with 1 Hole Setup Block 0.0002 Inch Overall Tolerance, 5/16 – 18 Inch Tapped Hole Size, 55-60 HRC Hardness, Sold As Matched Pair 52-439-001 – 63721997

Fowler 0.0003 Squareness Per Inch, Hardened Steel, 1-2-3 Block with 1 Hole Setup Block 0.0002 Inch Overall Tolerance, 5/16 – 18 Inch Tapped Hole Size, 55-60 HRC Hardness, Sold As Matched Pair

Manufacturer Part #: 52-439-001

S/N: 63721997

UNSPSC: 41111600

UPC: 646795115408

(Minimum Order Quantity=1, Package Quantity=1)