Stanley pro 180 i beam levels 3 vial stanley 1 42 920 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 600mm 24 in stanley 1 42 920 pro 180 i beam level 3 vial 60cm