Contents: Hex 19 mm x square 1/2" for sockets with drive as per DIN 3120 - C 12.5, ISO 1174, with ball locking device Hex 13 mm x square 3/8“ for sockets with drive as per DIN 3120 - C 10, ISO 1174, with ball locking device Hex 10 mm x square 1/4" for sockets with drive as per DIN 3120 - C 6.3, ISO 1174, with ball locking device Hex 10 mm x in-hex 1/4" suitable for all 1/4" bits Chrome-vanadium steel