Machinists Level, 4 In (100mm), 1 Vial/ ADJUSTABILITY: ADJUSTABLE DESIGN TYPE: SINGLE FACE OVERALL OUTSIDE DIMENSIONS: 4 IN. LG ADJUSTABLE CHARACTERISTICS: TRUE VIALS VIAL QUANTITY: 1 VIAL GRADUATIONS: INCLUDED VIAL GRADUATION VALUE: 0.035 IN. PER FT VIAL SURFACE FINISH: GROUND VIAL TYPE: LEVEL MATERIAL: IRON CAST