TheDEWALT Torpedo Levelhas an extruded aluminIum body with rare earth magnets and a V-Groove base for use on metal and rounded surfaces.Its solid block vials provide durability and accuracy to 0.5mm/m. Virtually unbreakable, the vials are factory set and require no further adjustment.The centre vial is magnified forreadability.Fitted with shockproof end caps, manufactured from an ABS plastic core with over-molded TPR rubber to provide best shock resistance.