T20263 Ultra Precision Ground 1-2-3 Block Set   See larger image and other views  Your Price:** $59.95 Description Each block is ground and case hardened on all six surfaces. Surface finish 6 to 16 micro inches Squareness on all sides to .0001" 23 holes: 5 tapped 3/8-16, 18 untapped thru holes Oversized to allow for normal tapping .0001" - .0003" Case hardened to 50-60 HRC Set consists of a pair of 1x2x3 inch blocks, five 3/8-16 stainless steel socket head cap screws, hex key wrench and custom molded case. See page 679 of our 2008 Grizzly Catalog! See page 38 of our 2008 Metalworking Catalog! See similar items in: > Home > Measuring Tools > Miscellaneous Measuring Tools Final prices will include state sales tax for items shipped to WA, MO, or PA. Shipping charges for items not shipped via truck freight will be added according to our shipping rates.