Milwaukee® ShockWave™ Impact Duty™ socket set, deep, impact rated: yes, measurement system: metric, 3 pc, 6 points, included socket size: 17 mm, 19 mm and 21 mm, 1/2 in drive, hex socket shape, case, specifications met: ASME specified, for use with: 1/2 in drive impact wrenches, drivers, ratchets and adapters, forged steel, black. Milwaukee® 49-66-7025 ShockWave™ Impact Duty™ Deep Socket Set, ASME Specified, 6 Points, 1/2 in Drive, 3 pc