the first end portion 33 is greater than the width of the body portion 35 the first end portion 33 has five nail positioning notches 36 cut through the top surface 31 and the bottom surface 32 and equally spaced around the border each nail positioning notch 36 has an opening 362 located on the end edge 332 of the first end portion 33 a passage 364 extended from the opening 362 toward the inside of the base member 30 and a round hole 366 connected to the end of the passage 364 remote from the opening 362 the round holes 366 of the five nail positioning notches 36 have different diameters for the insertion of nails having different diameters the width of the passage 364 of each nail positioning notch 36 is smaller than the diameter of the associating round hole 366 so that the nail that is inserted through the round hole 366 of one nail positioning notch 36 will not pass out of the round hole 366 through the associating passage 364 easily further the second end portion 34 of the base member 30 has a through hole 37 cut through the top surface 31 and the bottom surface 32 the nail punch 40 is made of a metal.