The (AB) Angle Brackets are part of RCI
Brushed Anodized Aluminum (28) or Brushed Anodized Dark Bronze (40).
RCI (Rutherford) AB-720 Angle Bracket - 1"H x 1"W x 18-3/4"L
For narrow aluminum frames or center-hung single-acting doors, when
inadequate space is left for mounting.
Compatible With 8372 electromagnetic lock