Multi-size Coverage: This 16-piece set includes sockets for 1/4″ drive (2mm, 2.5mm, 3mm, 4mm, 5mm, 5.5mm, 6mm), 3/8″ drive (7mm, 8mm, 9mm, 10mm, 12mm), and 1/2″ drive (14mm), along with 3 socket adapters.