These stanley fat max 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 life fax max levels have an accuracy of 05mmm on one face and 07mmm on the other which is covered under a 5 year accuracy guarantee the l