William Tools Standard
| Dimension of Drive | Test Load Min. (NM) | Material of Body | Material of Drive | Hardness of Body | Hardness of Drive | Width of Drive (mm) |
|---|---|---|---|---|---|---|
| 1/4" Dr. | 78 | Cr-V steel | Cr-Mo steel | Hrc40~45 | Hrc48~52 | 6.27~6.35 |
| 3/8" Dr. | 256 | Cr-V steel | Cr-Mo steel | Hrc40~45 | Hrc48~52 | 9.45~9.52 |
| 1/2" Dr. | 646 | Cr-V steel | Cr-Mo steel | Hrc40~45 | Hrc48~52 | 12.60~12.70 |
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