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■Non-sparking Tools
■Beryllium Copper & Aluminum Bronze
■Die Forged
■JIS
■Used to tighten or loosen bolts and nuts, suitable for use where space is limited of straight single box wrench.
| Number | S mm | L mm | Be-Cu g | Al-Br g |
| 157-10 | 10 | 119 | 60 | 50 |
| 157-12 | 12 | 151 | 85 | 75 |
| 157-14 | 14 | 151 | 85 | 75 |
| 157-16 | 16 | 174 | 150 | 130 |
| 157-17 | 17 | 174 | 160 | 145 |
| 157-19 | 19 | 207 | 195 | 190 |
| 157-22 | 22 | 207 | 205 | 180 |
| 157-24 | 24 | 250 | 330 | 295 |
| 157-27 | 27 | 250 | 315 | 275 |
| 157-30 | 30 | 295 | 480 | 430 |
| 157-32 | 32 | 295 | 455 | 410 |
| 157-34 | 34 | 307 | 650 | 580 |
| 157-36 | 36 | 307 | 650 | 580 |
| 157-38 | 38 | 340 | 830 | 740 |
| 157-41 | 41 | 340 | 810 | 720 |
| 157-46 | 46 | 370 | 1230 | 1100 |
| 157-50 | 50 | 400 | 1400 | 1255 |
| 157-55 | 55 | 430 | 1930 | 1720 |
| 157-60 | 60 | 450 | 2100 | 1900 |
| 157-65 | 65 | 470 | 2360 | 2135 |
| 157-70 | 70 | 490 | 3080 | 2800 |
| 157-75 | 75 | 510 | 3600 | 3250 |
| 157-80 | 80 | 530 | 4460 | 4030 |
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