Fastening part, method of producing the same, and mold device

A fastening part comprising:

• a two-dimensional arrangement of engagement elements including a plurality of engagement elements arranged corresponding to a plurality of lattice points of a planar lattice;
• a plurality of first ribs each connecting the engagement elements adjacently arranged in a first direction in the two-dimensional arrangement;
• a plurality of second ribs each connecting the engagement elements adjacently arranged in a second direction in the two-dimensional arrangement, the second direction different from the first direction;
• and
• a plurality of apertures formed in a fastening region in which the two-dimensional arrangement is provided,
• wherein the plurality of apertures includes a set of first apertures and a set of second apertures, the second aperture having an aperture area greater than an aperture area of the first aperture, and
• wherein the plurality of first ribs is arranged to allow the plurality of apertures to include the set of second apertures, each of the second apertures having the aperture area corresponding to two or more unit cells of the planar lattice thereby each of the second apertures being surrounded at least by six engagement elements.