The SYNTA-A is intended for mounting a Synta style dovetail bars to any counterbored hole. The adapter will clamp on to any dovetail bar from 27mm to 34mm.
See the attached image for the dovetail bar it was designed to fit. The adapter has five 1/4×20 tapped holes that matches several mounting holes found on a number of different ADM Accessories products.
The adapter can be mounted to the DPA, DVPA, VPA or MDS-PA. The adapter can also be mounted to any universal dovetail bar. 38mm long, 45mm wide, 2 oz.