Fed. Spec: ANSI B107.10MFeatures• Ball and spring socket retention.• Williams 1/4" Drive Ratchets Feature: * Ultra-fine 60 tooth model offers 6° tooth action in a narrow pear head. * Unique Finger-Fit handles to provide a comfortable, non-slip grip and extra turning power. * Choice of 36-tooth quick-release or 60-tooth ultra-fine gear. * Narrow pear-shaped heads for access into confined work areas. * High-polished chrome finish for easy cleaning.• Spinner handle features three component comfort grip handle.• 30012 - Drives 1/4" Drive Sockets & 1/4" Hex Bits