A universal keyless chuck to fit all sorts of cordless and corded drills. Below are some examples of the models they fit:
DCD931 DCD920 DCD980 DCD985 DC988K DC920K DC727K DC727C DCD940 DCD930 DCD936 DC981K DC980K DC940K DC940K DC984K DC930K DC987K DW981 DW980 DCD931 DCD920 DCD980 DCD985