SMDV (DA-02) Bowens Adapter for SMDV Speedboxes Softboxes (Speedbox-S40, S50, S60, S65, and S70) Bowens Adapter for SMDV Diffuser Speedbox softboxes Allows attachment of SMDV Diffuser Speedbox to Bowens mount Compatible with SMDV's plastic speedring Incomptabile with SMDV's Alpha Speedbox