Home / Arms / 1RI-H639 BK Adjust.1RI-H639 BK Adjust. Category: Arms Description Spec Sheet DescriptionSpec Sheet: 1RI-H639 BK 80-96 Adjustable ArmRelated products Arms 1RI-593B Arms 1RI-095-BK & CH 5D Adjustable Arm Arms 1RI-PU Pad 159 Arms 1RI-H634 4D Adjust.