Block Level Overall Height 1 5/8 in Overall Length 20 in Overall Width 1 11/16 in Number of V-Grooves 1 Number of Level Vials 1 Number of Plumb Vials 0 Number of Cross Test Vials 2 Vial Graduations .00024 in/ft Features V-Groove on Bottom for Shafts (Shafts Diameter.76 to 4.56 in) Total Number of Vials 1 Sensitivity 0.00024 in/ft Mount Type Not Applicable Frame Material Cast Steel Calibration Certificate Not Certified Level Orientation Horizontal