{
  "id": "wall_j_hook_120n",
  "level": "easy",
  "family": "mechanical_fixture",
  "prompt": "Design a simple 6061 aluminum wall-mounted J hook for a 120 N downward hanging load at the hook tip. It should visibly look like a hook, with a compact wall mount and a curved hook arm, not a ribbed cantilever bracket.",
  "image_prompt": "Realistic engineering product render of a compact aluminum wall-mounted J hook with a flat wall plate and curved hook arm, plain white background, centered, no text.",
  "semantic_hints": [
    "wall_mount",
    "j_hook",
    "hook",
    "curved_arm",
    "bolt_hole",
    "tip_load",
    "load_120n",
    "aluminum_6061"
  ],
  "bbox_mm": [
    160,
    90,
    180
  ]
}