Milwaukee Shockwave Impact Duty socket set, deep, impact rated: yes, measurement system: metric, 14 pc, 6 points, included socket size: 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm and 21 mm, 3/8 in drive, hex socket shape, case, for use with: 3/8 in drive impact wrenches, drivers, ratchets and adapters, forged steel, black.