All dimensions are center-to-center. Oblong pad eyes are measured as shown. Round pad eyes are measured inside hole to inside hole, not across the middle (not shown). Rectangular pad eyes are measured in the direction of the eye (A), and across the eye (B). Diamond pad eyes are measured on the long axis (A), followed by the narrow axis (B). Some models have slight variations due to imprecise machining when countersinking. *Hole center A is the larger of the two center-to-center dimensions, A and B.