Patented Wright Drive design distributes contact over a larger surface area for greater gripping power and strength
| Part Number | Class | Drive | Nut End Config. | Style | SAE or Metric | Finish | Nut end Nom. Size | Shape / Drawing | Overall Length -L | Nut End Diameter - Ds | Drive End Diameter - Dd | Nut End Depth - Bd |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 31-08MM | Hand | 3/8"Dr | 12 Pt | Standard | Metric | Chrome | 8mm | I | 24.13 | 12.17 | 15.88 | 3.96 |
| 31-09MM | Hand | 3/8"Dr | 12 Pt | Standard | Metric | Chrome | 9mm | I | 24.13 | 13.46 | 15.88 | 4.37 |
| 31-10MM | Hand | 3/8"Dr | 12 Pt | Standard | Metric | Chrome | 10mm | II | 24.13 | 15.11 | 15.11 | 4.78 |
| 31-11MM | Hand | 3/8"Dr | 12 Pt | Standard | Metric | Chrome | 11mm | II | 24.13 | 15.88 | 15.88 | 5.94 |
| 31-12MM | Hand | 3/8"Dr | 12 Pt | Standard | Metric | Chrome | 12mm | II | 24.13 | 17.48 | 17.48 | 6.35 |
| 31-13MM | Hand | 3/8"Dr | 12 Pt | Standard | Metric | Chrome | 13mm | II | 24.13 | 18.29 | 18.29 | 7.95 |
| 31-14MM | Hand | 3/8"Dr | 12 Pt | Standard | Metric | Chrome | 14mm | II | 24.13 | 19.43 | 19.43 | 9.93 |
| 31-15MM | Hand | 3/8"Dr | 12 Pt | Standard | Metric | Chrome | 15mm | II | 24.13 | 20.57 | 20.57 | 9.93 |
| 31-16MM | Hand | 3/8"Dr | 12 Pt | Standard | Metric | Chrome | 16mm | II | 25.40 | 22.23 | 22.23 | 10.31 |
| 31-17MM | Hand | 3/8"Dr | 12 Pt | Standard | Metric | Chrome | 17mm | II | 25.40 | 23.37 | 23.37 | 9.93 |
| 31-18MM | Hand | 3/8"Dr | 12 Pt | Standard | Metric | Chrome | 18mm | II | 25.40 | 24.61 | 24.61 | 10.31 |
| 31-19MM | Hand | 3/8"Dr | 12 Pt | Standard | Metric | Chrome | 19mm | II | 25.40 | 25.40 | 25.40 | 11.89 |
| 31-20MM | Hand | 3/8"Dr | 12 Pt | Standard | Metric | Chrome | 20mm | II | 31.75 | 27.38 | 27.38 | 16.78 |
| 31-21MM | Hand | 3/8"Dr | 12 Pt | Standard | Metric | Chrome | 21mm | II | 31.75 | 27.78 | 27.78 | 16.45 |
| 31-22MM | Hand | 3/8"Dr | 12 Pt | Standard | Metric | Chrome | 22mm | II | 33.35 | 29.36 | 29.36 | 17.71 |