| DRIVE END OUTSIDE DIAMETER | 0.505 INCHES MAXIMUM |
| DRIVE END SHAPE | SQUARE SINGLE END INTERNAL |
| DRIVE SURFACE SIZE | 0.250 INCHES NOMINAL SINGLE END |
| FEATURES PROVIDED | MANUAL TOOL |
| OVERALL LENGTH | 1.938 INCHES MAXIMUM |
| MATERIAL | STEEL OVERALL |
| NONDEFINITIVE SPEC/STD DATA | 2 TYPE AND 2 CLASS AND B STYLE |
| SPECIAL MARKINGS | 3/8 IN. |
| STYLE DESIGNATOR | INTERNAL-INTERNAL |
| WRENCHING END OPENING DEPTH | 0.250 INCHES MINIMUM |
| WRENCHING END OUTSIDE DIAMETER | 0.534 INCHES MAXIMUM |
| WRENCHING SURFACE SHAPE | 12 POINT SINGLE END INTERNAL |
| WRENCHING SURFACE SIZE | 0.375 INCHES NOMINAL SINGLE END |
| SURFACE TREATMENT | OXIDE AND CHROMIUM AND NICKEL OVERALL |