Fits D Series dovetail bars. D Series dovetail clamp allows you to attach the Celestron StarSense 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. as shown 14 oz.