The Milwaukee Hand Tools Block Torpedo Level has a die-cast aluminium body, perfect for tough job site conditions. Amplified rare earth magnets provide maximum holding power. Its precision milled measuring surface provides maximum accuracy. SHARPSITE™ vial technology improves the readability of the vial. Reinforced plumb vials and solid, acrylic block vials offer maximum durability. It has a locking 360° adjustable vial. Identify and repeat any angle needed on the job site. Lock vial in place to keep accuracy in and out of pocket/pouch. Accurate to 0.029° (0.0005in, 0.5mm/m) in standard position.