Stanley fatmax spirit levels 3 vial stanley 1 43 536 these stanley fatmax heavy duty box levels are machine milled on two sides to ensure accuracy and have improved vial views for ease of use the large centre vial is bridged to allow a continuous line to be marked on the work piece the dual bi material grips are ideal for carrying and vertical levelling and the levels have shock absorbing end caps for longer lifefaxmax levels have an accuracy of 05mmm on one face and 07mmm on the