Plates help protect fiberglass and aluminum panels from cracking when using 7/16 Inch quick turn fasteners. Stainless steel plates are precision stamped with a strengthening border, attach with 1/8 Inch rivets, and measure 2 Inch wide x 1 Inch tall with 1-17/32 Inch center to center rivet spacing. ALL18985-50 is the clear finish 50-pack.