Two Piece 123 Block Set Ultra Precision Machinist Blocks 1 Inch By 2 Inch By 3 Inch Hardened Tool Steel Ground On All Sides 0.0002 Inch Tolerance With 23 Holes Square And Flat For Accurate Setup And Measurements

Two-Piece 1-2-3 Block Set: Hardened Tool Steel, 23 Holes
✔️ 1 x 2 x 3 in blocks,.0002 in tolerance, 23-hole, hardened steel

These two-piece 1-2-3 blocks are hardened tool steel and ground on all six sides for true squareness and flatness. Measuring 1 x 2 x 3 in, they are built for accurate setup and measurement in milling, drilling, and inspection work. The set includes 23 holes for precise locating and 5 tapped holes to 3/8-16, with a surface finish of 6-16 microinches and hardness around HRC 56-62.

✅ Size: 1 x 2 x 3 inches, two-piece matched pair
✅ Material: hardened tool steel, ground on all six sides
✅ Holes: 23-hole pattern for locating and alignment
✅ Tap holes: 5 tapped to 3/8-16; rest untapped
✅ Finish & hardness: 6-16 microinches, HRC 56-62

💡 What is a 1-2-3 block set used for in precision machining?

A handy reference for layout, squaring, and measurement. - Helps square up edges and verify perpendicularity. - Used in milling, drilling, and inspection for repeatable setups. - 23-hole pattern allows flexible locating and spacing. - Hardened tool steel ensures durability in busy shops. ✝️