Breaker Bar, Drive Size 3/8 in, Alloy Steel, Black Oxide, Overall Length 8 1/2 in, Flexible/ OVERALL LENGTH: 8.500 INCHES NOMINAL DRIVE SURFACE SIZE: 0.375 INCHES NOMINAL SINGLE END DRIVE END SHAPE: SQUARE SINGLE END EXTERNAL SPECIAL FEATURES: STRAIGHT ROUND KNURLED STEEL HANDLE MATERIAL: STEEL OVERALL SURFACE TREATMENT: OXIDE OVERALL STYLE DESIGNATOR: 86 HINGED SPECIFICATION/STANDARD DATA: 0U583-SAE AS4283 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 1 CLASS