6405M37 Koken 12pt Socket 3/4 in Dr 37mm - Made In Japan, Highest Quality, Most Dependable Flat Drive sockets to ensure a flat surface contact between the socket and the Bolt/Nut. The flat drive system reduces wear and allows to transmit a higher torque value. Cold Forged Heat Treated Chrome Molybdenum Alloy exceeding Din 3129, ISO2572-2 Standards. Contents/Specs 3/4in Dr Socket 12pt 37 x 59mm