We are manufacturer of chain wheels which are dimensionally accurate, Durable finish standards and Easy installable. Details For 1/2" x 1/8" chain available in 28,32, 40, 42, 46, 48, 52T. Crank : 4", 5" 5-1/2", 6", 6-1/2", 6-3/4" Cottered type / cotterless type Finishing : BCP or Black Powder Coated