Home / Arms / 1RI-H634 4D Adjust. 1RI-H634 4D Adjust. Category: Arms Description Spec Sheet Description Spec Sheet: 1RI-H634 4D Adjustable Arm Related products Arms 1RI-PU Pad 159-1 Arms 1RI-H639 BK Adjust. Arms H-637S S2 Adjust. Arms 1RI-080-BK L+R