Expert quality with front viewing plumb site dual view giving 33 improved magnified vial viewing aluminium box section extrusion with milled top and base except 1800mm electrostatically powder coated and baked with polyester acrylic paint with ergo grip nonslip soft grip handles tough bi material end caps one horizontal 1800mm has two and two magnified vertical vials accuracy 05mm per 1m 0029 in standard position