The Stanley 1-42-921 PRO-180 I-Beam Level is a durable and heavy-duty spirit level constructed with an I-beam aluminium profile for strength and longevity. It features a shock-absorbing end cap and a pipe groove for secure use on rounded surfaces. The level includes 3 vials: one fixed horizontal vial, one 180° rotating vial, and an easy-to-read center vial. The horizontal vial can be viewed from both the side and above for enhanced usability. This level is accurate to ± 1.5mm/1m and has a length of 800mm (32 inches).