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Inside Diameter: The distance across the center hole, or bore, of the product. This dimension should match the diameter of your shaft or bolt.
Keyway: The width of the key used to anchor the pulley to a shaft. A negative keyway means this has an integral keyway, so no separate key will be needed to anchor the pulley.
Most shafts have the following standard keyway sizes:
Shaft Size/ Inside Diameter
Standard Keyway Size
Material: Describes what the product is made from. Plastic, aluminum, and diecast are softer, lighter, and do not rust. Steel and cast iron are meant for heavy-duty applications, but can rust in certain circumstances.