OX Tools Heavy-Duty Box Level - 48" Plumb Site vial viewer allows plumb vial to be read from a front view position, eliminating the parallax error and increasing efficiency Bi-material, air-cushioned shockproof end caps protect levels from the force of falls, maintaining level integrity and vial accuracy Equipped with dedicated wall grips on both sides of the level, providing symetrical use and preventing damage of work surface Soft Grip handles with engineered cushioning for a better, longer, and more comfortable grip Non-slip handle design lessens slipping of level in wet conditions