The VPA-SYNTA-FF is a double sided female to female dovetail clamp. One side clamps onto Vixen “V” Series dovetail bars while the other side clamps the SYNTA style dovetail bar. This narrower SYNTA dovetail is found on products like the ASIAir, Svbony Finderscopes, Astromania Finderscopes as well as Orion and Vixen finderscopes. The jaws on the SYNTA side will open from 29mm to 33mm. The SYNTA side will not fit a “V” Series dovetail bar.