Fits D Series dovetail bars. Attaches directly to Takahashi or other mounts that have two 8mm tapped holes 35mm apart. Incorporates a split clamp design that grips the dovetail bar along the entire surface of the saddle and will not dent or scratch the dovetail bar. The dovetail clamp has a large locking knob for tool free operation, spring loaded jaws, anodized aluminum and stainless steel construction. 2.5″ Long, 4″ Wide, .75″ Thick, Wt. 10 oz.