Master mechanic, 54 piece, 1/4 x 3/8" drive, mechanics tool set: set includes: 1/4 drive 6 point sockets sae sizes: 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 7/16", 1/2", metric sizes: 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm & 13 mm, 3/8 drive 12 point sockets sae sizes: 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", metric sizes: 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 17 mm & 18 mm, phillip bits: #1, 2 & 3, slotted bits: 4, 5.5 & 6.5, torx bits: 10, 15 & 20, 1/4 drive spinner handle, 1/4 drive bit adapter, 3/8" tear drop ratchet, 3/8 drive 3" extension bar, 3/8 drive 5/8" spark plug socket.