This is an impact socket set. It has 26-pieces. Design makes socket strong and durable. Set includes: 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm,19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 32 mm, 33 mm, 34 mm, 35 mm and 36 mm.