Hand Ratchet, Standard, Pear, Reversing Yes, Alloy Steel, Minimum Arc Swing 15 °/ OVERALL LENGTH: 5.000 INCHES NOMINAL DRIVE SURFACE SIZE: 0.250 INCHES NOMINAL SINGLE END DRIVE END SHAPE: SQUARE SINGLE END EXTERNAL SPECIAL FEATURES: STANDARD HEAD; 24 TOOTH; STRAIGHT ROUND KNURLED STEEL HANDLE MATERIAL: STEEL OVERALL SURFACE TREATMENT: OXIDE OVERALL STYLE DESIGNATOR: 87 RATCHET SPECIFICATION/STANDARD DATA: 05047-ASME B107.10M PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 2 CLASS