Stabila 37524 Heavy Duty 59"/24" Type 196 Construction Level Set w/ 6-Pocket Jamber Case Crystal clear vials readable in any direction with no change in accuracy tolerance Spring steel hairline indicators in vials Locked vial system, no recalibration needed Removable rubber end caps for scribing in corners and for reading tight header Two rubberized hand holds for comfort and grip (16" version has one hand grip)