Alloy spirit level this alloy spirit level is an extruded aluminium pro spirit level that has ribbed sides for strength and accuracy it features vertical and horizontal vials showing 90 and 180 and is accurate to 1mm per 1m the heavy duty extrusion gives maximum stability and accuracy and the vial fixing is unique in design and ensures level is shock proof and also has a 3 year guarantee against leakage sprit level ribbed sides vertical and horizontal vials 90 and 180 degrees