Model EV-S115 is the cast aluminium frame spirit level which is have own special for a few characteristics:It is heavier than most of general spirit level,it have the pencil inside the frame. This model of level based on the following features and details: 1)There are three biger,clear,high accuracy level vials in the spirit level,one is horizontal and one vertical and one 45degree. 2)Hole cast aluminium for the spirit levels.It is heavier and stronger than any other spirit levels. 3)Six sides of the spirit levels are milled working face for higher accuracy. 4)Accuracy is 0.5mm/m in normal position. 5)There is a pencil inside the frame for each piece of level. 6)Specifications:16"(400mm),20"(500mm),24"(600mm). 7)It can make a sticker then stick on the level. 8)Packing:Each piece OPP bag shrinking then 24pcs packed in carton. If you need more details about this type of level pls do not hesitate to contact me.