| DRIVE END OUTSIDE DIAMETER | 0.875 INCHES NOMINAL |
| DRIVE SURFACE SIZE | 0.375 INCHES NOMINAL SINGLE END |
| DRIVE END SHAPE | SQUARE SINGLE END INTERNAL |
| HARDNESS RATING | 45.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM |
| OVERALL LENGTH | 3.188 INCHES NOMINAL |
| MATERIAL | STEEL COMP 4140 OVERALL |
| SPECIAL FEATURES | SIDE AND FACE MILLED OUT TO ACCOMMODATE SPARKPLUG |
| WRENCHING END OPENING DEPTH | 0.500 INCHES NOMINAL |
| WRENCHING END OUTSIDE DIAMETER | 0.625 INCHES NOMINAL |
| WRENCHING SURFACE SHAPE | 6 POINT SINGLE END INTERNAL |
| WRENCHING SURFACE SIZE | 0.625 INCHES NOMINAL SINGLE END |
| STYLE DESIGNATOR | INTERNAL-INTERNAL |