The (AB) Angle Brackets are part of RCI
Brushed Anodized Aluminum (28) or Brushed Anodized Dark Bronze (40).
RCI (Rutherford) AB-712 Angle Bracket - 1-1/2"H x 1-1/2"W x 9-3/8"L
For narrow aluminum frames or center-hung single-acting doors, when inadequate space is left for mounting.
Compatible With 8371 electromagnetic lock