1 x STANLEY(r) Basic I-Beam Level 60cm The STANLEY(r) Basic I-Beam Level has three 12mm vials for levelling at varying angles (180, 90 and 45). There is also a top window for clear and effortless vial reading from above. These integrated vials are encased in oversized, rugged plastic caps for increased protection and sustaining the vials accuracy. A continuous edge on both sides enables the level to be used as a ruler for marking up. The yellow, powered-coated finish provides added surface protection. There is also a handy hang hole for easy storage. Precise levelling performance with 2.0mm/m accuracy on all working edges.