Drive SAE/Metric Ratchet and Socket Tool Set, #56 Pieces. Includes: standard sockets: 1/4 in. 6 mm, 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 deep well sockets: 1/4 in. 6 mm, 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 accessories: 3 in. Extension, universal swivel 90-tooth ratchet.