Y-Bar, Left Roller Plate, Step 4: Circular Hook Attach a circular hook to the bracket. Due to availability issues, you have a circular hook with either M4 or M5 thread; if M5, nuts and washers are included with the hook. Circular hook M4/M5 nut M4/M5 washer M4/M5 washer M4/M5 nut Previous – Next Back