Abstract: A concrete forming panel system as disclosed having at least two panels wherein each panel has a pair of spaced apart sidewalls. Each panel has at least one opening along each sidewall and the panels are adapted to be positioned in a side-by-side relationship so that one sidewall of each panel abuts against the sidewall of the adjacent side panel and, upon doing so, the opening in one sidewall of the first panel registers with the opening in the abutting sidewall of the adjacent panel. An elongated wall pin is pivotally secured to one end of an arm while the other end of the arm is pivotally mounted to its associated panel. The arm is pivotal between an extended position in which the wall pin extends through registering openings on adjacent panels, and a retracted position in which the wall pin is retracted from the registering opening in the adjacent panel. The wall pin and arm construction is particularly advantageous for confined spaces, such as an inside corner form.