It is a set product of Sumitomo 040 type DL/SL waterproof F terminal (S size) and wire seal (M size).
With the above combination
It is compatible with AVS0.5 electric wires.

■S size terminal
Applicable wire size of terminal 0.3-0.5 square millimeter
■M size wire seal
Wire finish outer diameter 1.8-2.2 mm

■ Sales of wire seal alone (sold separately) "WS7165-0548DL-SL-BL"