... frame thickness and colour oxidized coated. 2.)3pcs of entire level indicate level,45,plumb. ). Heavy duty aluminum alloy frame thickness ... .2).3 pcs of entire level vial indicate level, 45° and plumb with viewfinder,which 90°bubble could be observed from the ... , shockproof and protects ruler body.Spirit levelsize:300,400,500,600,800,1000mm Heavy duty aluminum alloy frame thickness Spirit level MTO011