STANLEY® 85-388, 1/4″ DRIVE 21 PIECE FRACTIONAL SOCKET SET, 6 POINT STANLEY® DRIVE TOOLS ARE FORGED FROM HIGH-QUALITY STEEL AND FINISHED IN HIGH-POLISH NICKEL CHROME OR BLACK CHROME. SELECTED RATCHET HANDLES ARE ERGONOMICALLY DESIGNED AND HAVE AN EASY-TO-USE, THUMB-OPERATED REVERSE-SWITCH MECHANISM. SOCKETS AND EXTENSION BARS REMAIN LOCKED ONTO THE DRIVE UNTIL DISENGAGED WITH AN EASY-TO-REACH, LOW-PROFILE QUICK-RELEASE BUTTON. SOCKETS FEATURE OUR MAX-DRIVETM DESIGN, A UNIQUE RADIUS CORNER DESIGN THAT PROVIDES 15% MORETORQUE TO TIGHTEN FASTENERS EASILY AND SIMPLIFY THE TURNING OF ROUNDED CORNERS. MAX-DRIVETM HELPS REDUCE FASTENER WEAR BY MINIMIZING CONTACT ON THE OUTER 5% OF THE FASTENER, HELPING TO INCREASE LIFE EXPECTANCY. MAX-DRIVETM HELPS REDUCE SLIPPING ON FROZEN OR RUSTED FASTENERS. ALL STANLEY® RATCHETS, SOCKETS AND WRENCHES ARE MANUFACTURED GLOBALLY TO STANLEY SPECIFICATIONS, MEETING AND OFTEN EXCEEDING ANSI SPECIFICATIONS. INCLUDES: 6 POINT STANDARD: 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 7/16, 1/2 INCH. 6 POINT DEEP: 1/4, 9/32, 5/16, 11/32, 3/8, 7/16, 1/2 INCH. ACCESSORIES: 3, 6″ DRIVE EXTENSION BARS, PEAR HEAD RATCHET, SPINNER HANDLE, UNIVERSAL JOINT. BLOW-MOLDED CASE.