Grand Master Lock Pick Set, No. LT-620 From Lock Technology, Inc. (LTI Tools) Lock Technology's Grand Master Lock Pick Set, No. LT-620, contains 35 picks. The set includes the LT-280, LT-290, LT-300, LT-310 and LT-320, as well as the LT-330-tension wrench and 106-gas cap pick tool. Packaged in a custom leatherette case.