Patent ID: 6921237

Claim:
A fastener comprising: (a) a substantially flat head portion having an upper side, and a lower side, the upper side having a first engageable hole, the first engageable hole having a first axis, the first axis being substantially perpendicular to the substantially flat head portion; (b) a neck having an opening and two side neck portions, the neck extending from the lower side of the substantially flat head portion at a substantially right angle with respect to the substantially flat head portion; (c) two substantially flat legs extending from the neck, each leg having an inner surface, the two inner surfaces of the two legs being at an initial proximity with each other, the legs being expandable in opposite directions upon inserting through and engaging to the first engageable hole an expansion member, thus bringing the expansion member to a contact region of the legs; and (d) a funnel in the vicinity of the contact region, the funnel being substantially curved and substantially co-axial with the first engageable hole; wherein the funnel comprises a positively engageable tab extending from said substantially curved funnel in a direction toward the head.