‎Tri Block - Model PR123-23 Hole-1″ × 2″ × 3″

‎•Ideal for Precision Layout & Setup •Each set consists of a matched pair of 1 2 3 blocks, five 3/8″,-16 stainless steel socket head cap screws, hex key, and shop-hard-molded case. •Each block precision ground on all six surfaces •Case hardened (HRC 55 60) •Surface finish from 6 to 16 microinches •Squareness on all sides to within 0.0001″ •23 holes: 5 tapped 3/8″,-16 ; 18 untapped thru holes •The cross drilling is designed to give minimum weight yet maximum strength •Oversized to allow for nominal 0.0001″ / 0.0003″

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