The Stanley 47-720 Post Level has built-in magnets for use on metal posts, other surfaces and is supplied with heavy-duty elastic.It folds flat for reduced risk of damage in transit and is easy to store and is also portable when not in use, gives complete protection to the vials. When closed there is an area for storing small bits, blades, etc. Specification: Vials: 2. Ref: UTTK14653