GEARWRENCH 80587 7-Piece ball hex set, standard length, 3/8-Inch drive consisting of 4, 5, 6, 7, 8, 9, and 10 millimeter ball hex bit sockets. GEARWRENCH ball hex bit sockets are great for use in tight spaces. Ball hex bit works with standard 3/8 drive ratchet and 3/8-Inch drive sockets, both standard and deep. The ball end of the ball hex socket inserts into a standard socket. This allows the socket to pivot up to 30 degrees and still drive the fastener. Ball hex bit sockets are made to gear wrench's precision specifications. Knurled line on drive end designates metric size and large hand stamp makes sizes easy to read and locate.