Standard pack = 2 piece(s). Type = Flanges - Nylox Steel ; Adapted Arbor Hole Size = 1-1/2 Inch ; Arbor Hole Size = 1-1/2 Inch ; Fixed Arbor Hole Size = 5-1/4 Inch ; For Use With = 5-1/4" I.D. Wheels;Ends of a Gang Mount;Pairs and Priced per Pair;Conjunction with Pressboard Adapters ;