The Phidgets #40 Chain Sprocket w/ 14mm Bore & 20 Teeth is crafted from hardened steel, designed for compatibility with half-inch roller chains. It features a 14mm bore equipped with a keyway, ensuring a secure fit onto a 14mm shaft. The sprocket is engineered to provide a robust connection through a 5mm keyway, complemented by two 2.5mm hex screws for additional stability. This product is specifically intended for use with #40 size chains.