Hand Ratchet, Standard, Pear, Reversing Yes, Alloy Steel, Minimum Arc Swing 15 °/ OVERALL LENGTH: 20.000 INCHES NOMINAL DRIVE SURFACE SIZE: 0.750 INCHES NOMINAL SINGLE END DRIVE END SHAPE: SQUARE SINGLE END INTERNAL SPECIAL FEATURES: STANDARD HEAD; 24 TOOTH; THIN HEAD; STRAIGHT ROUND KNURLED HANDLE MATERIAL: STEEL OVERALL SURFACE TREATMENT: CHROMIUM OVERALL STYLE DESIGNATOR: 87 RATCHET SPECIFICATION/STANDARD DATA: 05047-ASME B107.10 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 2 CLASS