In an example, a system includes a bracket and a fastener. The bracket includes a distal bracket portion defining an aperture. The aperture includes a first aperture section of a first width and a second aperture section of a second width. The second width is less than the first width. The bracket includes a proximal bracket portion extending from the distal bracket portion, a cavity defined by the distal bracket portion and the proximal bracket portion, and a magnet in the cavity and coupled to the proximal bracket portion. The fastener includes a stem extending from a first end to a second end. The first end is configured to couple to an object. The fastener includes a ferromagnetic retainer at the second end of the stem. The ferromagnetic retainer has a third width that is less than the first width and greater than the second width.