A fastening apparatus includes a first part comprising a plurality of first projections and a plurality of first holes. A washer part comprises a plurality of second holes corresponding to the plurality of first projections and a plurality of openings corresponding to the plurality of first holes. The washer part and the first part are positioned on a first side of a first material of a product. A second part having a plurality of second projections is positioned on a second side of the first material. Each of the plurality of second projections penetrates a respective opening of the washer part, wherein penetration by each second projection of the corresponding opening causes a deformation of a portion of a second material of the washer part proximate to the corresponding opening.