Strong and economical, these sprockets have a molded Nylon body reinforced with Fiberglass for less weight, quieter operation, and self-lubrication of teeth. Designed for use with 1/4 inch pitch Roller Chains. Nylon Roller Chain Sprockets are frequently applied to maintain accurate register in fractional horsepower chain drive assemblies, such as business machines, displays and servo systems. Alloy Steel set screws #10-24 provided