Fits D Series dovetail bars. D Series dovetail clamp allows you to attach accessories to a D series dovetail bar. 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.