- 用於孔徑和槽寬等測量用的比較測量工具。
- 測砧插入小孔用壓板固定後抽出，就可以通過外徑千分尺測量孔內直徑。
規格:
| Metric | Inch | ||
| Order No. | Range (mm) | Order No. | Range (in) |
| 6-gage Set | 6-gage Set | ||
| 155-905 | 8 – 150 | 155-903 | 0.313 – 6 |
| Gages included | Gages included | ||
| 155-127 | 8 – 12.7 | 155-121 | 0.313 – 0.5 |
| 155-128 | 12.7 – 19 | 155-122 | 0.5 – 0.75 |
| 155-129 | 19 – 32 | 155-123 | 0.75 – 1.25 |
| 155-130 | 32 – 54 | 155-124 | 1.25 – 2.125 |
| 155-131 | 54 – 90 | 155-125 | 2.125 – 3.5 |
| 155-132 | 90 – 150 | 155-126 | 3.5 – 6 |
