1 1/2 x 3 ft 5/8 holes 2in from center
everything was made with a 1/32in clearance on each side so there shouldn't be a need to grind anything down it wouldn't hurt to bevel the corners to help the pieces go together easier designed to be expandable to make a larger table like 3x3ft, 3x4 1/2ft, or 3x6ft