Abstract: Jamb connectors for finishing a penetration in concrete or masonry construction, the jamb connectors coupling a first jamb with a second jamb that is adjacent to the first jamb and having a first portion with two segments lying substantially in a same plane and positioned at a predetermined angle from each other, each first portion segment being configured for coupling with an associated surface portion of an associated one of the first and second jambs, and a second portion having two segments that are each coupled to corresponding segments of the first portion, each second portion lying at an angle equal to the predetermined angle from the other second portion and second portion being configured for positioning about the intermediate portions of one of the first and second jambs.