A sleeve for protecting a utility conduit or conduits passing through a hole in a stud used in building construction. A body portion forms a longitudinally extending hollow trough having side edges, wherein each said side edge portion has overlapable or interlockable fingers. The trough includes a circular side section, with a diameter defining a body width. This circular side section is changeable by compression with either the human hand or a conventional hand-tool to adapt the body width, and thus the sleeve, to coincide with a potential range of stud hole sizes. Engagement of the sleeve in the hole is achievable by placing an inserted end into the hole and pressing a worked end. A stop portion at the worked end stops insertion of the sleeve beyond the stud face, and a retention portion in the sleeve affirmatively retains the sleeve within the hole once thus inserted.