The CRL Adjustable Top Door Patch Fitting includes an adjustable pivot insert that allows for 3 degrees of movement for proper alignment of the door to the jamb when in the closed position. For use with our CRL9970 Overhead Concealed Door Closer. Finished covers are available in five standard finishes. Gaskets are supplied that allow this Patch Fitting to be used with either 3/8" or 1/2" (10 or 12 mm) Glass.