• Adaptor for hand used nut driver sockets • ¼” external square • With friction ball; for regular nut driver sockets • 1/4" hexagon drive. DIN 3126, ISO 1173, style C 6.3 • Suitable for DIN 3120, ISO 1174, style A 6.3 • In plastic box of 5 pieces and in a blister card of 1 piece