Cotter pins are half-round wires that are folded over themselves with a loop at one end, which creates a head. These pins anchor various assemblies by insertion through a drilled hole in a shaft or bolt and then spread the points to hold the assembly into position. A cotter pin is easy to install and remove and is commonly used to secure a wheel or machine component on an axle. A split pin has two long tines that are bent to hold it in place.

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