1/2" Sq.Dr. Shallow air Impact Sockets, 6PT/MM: 1) Both with groove ... are available 2) 8MM-41MM 3) ISO9001 1/2" Sq.Dr. Shallow air Impact Sockets, 6PT / MM Specifications:8, 9, 10 ... , 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 32, 33 ... best choice.Thanks for visiting our website!! 1/2" Sq.Dr. Shallow air Impact Sockets, 6PT/MM