herex's Large Size Rivet Nuts are available in sizes up to 3/4-10 (M20). Provide a Strong Thread in Thin Sheet Materials. Can be Installed from One Side of the Work Piece. Do Not Need to be Welded to the Base Material. Available in a Round Body or a Full Hex Body For Increased Spin Out Resistance. Plated with a RoHS Complaint Zinc Trivalent Clear Plating.