• Silver anodized, extruded aluminum I-beam frame with shock-absorbing, protective end-caps• Barrel vials fit into precision-stamped cutouts and are held in place by "Quick-Change" ABS plastic vial covers for easy replacement• Rule screen-printed on one leveling surface, calibrated in 16ths on one edge and centimeters on the other• protective end-caps• Barrel vials fit into precision-stamped cutouts and are held in place by "Quick-Change" ABS plastic vial covers for easy replacement• Rule screen-printed on one lev eling surface calibrated in 16ths on one edge and cen• 3 Vials: 1 Level/2 Plumb• Lgth In=24