This saddle is designed specifically to fit Arca-Swiss style dovetail bars. Two 8mm socket head counterbored holes 35mm apart and two 8mm socket head counterbored holes 3″ apart . Split clamp design grips the dovetail bar along the entire surface of the saddle and will not dent or scratch the dovetail bar. Features two large locking hand knobs for tool free operation, spring loaded jaws, anodized aluminum and stainless steel construction. 6″ Long, 1.8″ Wide, .625″ thick, Wt. 12 oz.