AIRBUS CALIBRATION BLOCK SET-99D57004001000 (Inch Version) TITANIUM Airbus A318/A319/A320/A321 Calibration Block Set. 51-63-03-Pb1 Pages 4&5, Figure 51-63-03-991-002-A Sheet 01 And Figure 51-63-03-991-002-A Sheet 03. BLOCK CONTAINS 3 PLATES OVERALL DIMENSION – 7.5" (L) X 6" (W) TOP PLATE THICK – 0.08" MIDDLE PLATE THICK – 0.5" BOTTOM PLATE THICK – 0.08" CONTAIN (20) HOLES – Ø0.25", 0.27", 0.28", 0.29", 0.31", 0.33", 0.34", 0.36", 0.38", 0.39", 0.41", 0.42", 0.44", 0.45", 0.47", 0.48", 0.5", 0.52", 0.53" and 0.55". MIDDLE PLATE CONTAIN 2 CORNER NOTCH FOR EACH HOLE (20) TOP NOTCH – 0.02" (D) X 0.006" (W) (20) BOTTOM NOTCH – 0.006" (D)X 0.006" (W) (6) BOLT & NUT DIA -0.26". STANDARD/MANUFACTURE REFERENCE/PART NUMBER: 99D57004001000 MATERIAL: TITANIUM. NOTE: For special alloy request by mail.