Patent ID: 7726925

Claim:
A fastener comprising: a plate-shaped flange having top and bottom surfaces, and a first prong extending in a direction that is substantially perpendicular to the surfaces of the plate-shaped flange; and a shaft, said shaft extending upwardly from the top surface of said plate-shaped flange, and including an opening aligned with said shaft, the opening being remote from said flange, said plate-shaped flange including a periphery including four straight sides, the four straight sides being a first straight side, a second straight side, a third straight side and a fourth straight side, the first and the third straight sides being parallel to each other, the first and third straight sides being orthogonal to the second and fourth straight sides, and a first straight edge (C 1 ) extending in a direction substantially perpendicular to the first straight side; a first arcuate side connecting the first straight side and the second straight side; and a third arcuate side connecting the third straight side and the fourth straight side; wherein the first prong is adjacent to the first straight edge (C 1 ), and includes a straight inner edge (E 1 ) that is perpendicular to the first straight side of the flange, and an outer edge (E 3 ) including a fourth arcuate side.