Ideal for unfastening damaged nuts and screws and especially for locking wheel nuts|The special rounded profile of the inside enables the socket to grip sufficiently to unfasten it in cases where standard sockets and wrenches fail|BWTSP16: 16 pcs|3/8": 8, 10, 11, 12, 13, 14, 16, 17, 18, 19 mm|1/2": 21, 22, 24, 27 mm|Adaptor: 1/2" female to 3/8" male|Puncher|Not suitable for machine operation