Stanley pro 180 i beam levels 3 vial stanley 1 42 919 durable heavy duty i beam aluminium level with 1 x fixed horizontal vial and 1 x 180 rotating vial top easy to read centre vial the horizontal vial can be viewed from both side and above for ease of useshock absorbing end caps and pipe groove for use on rounded surfaces2 vialsaccurate to 15mm1mlength 400mm 16 in stanley 1 42 919 pro 180 i beam level 3 vial 40cm