The Bush W58 Set has fiber optics mount to stick on the compatible housing (*1) to hold an Optical D Cable Type L to link to an external strobe for more reliable slave flashing comparing to wireless slave connection especially in bright condition like just under surface or backlit.
Supports dual strobe system as the fiber optics set can hold maximum two Optical D Cable Type L.

Rubber Bush Base pasted on the housing (left) and Overlap structure with supplied Rubber Bush Base Sticker (right)
(*1) The Rubber Bush Base is not reusable once it is removed from a housing. When necessary use Spare Adhesive Sheet supplied with the Bush W58 Set.