The AndyMark 24T Plastic HTD Pulley Universal Extension is designed for use with 5 mm pitch HTD timing belts. It offers versatility with three bore options: 1/2 inch Hex, 3/8 inch Hex, and Nub. This pulley can accommodate a 9mm wide belt or, with the addition of a Pulley Extension, a 15mm wide belt or two 9mm wide belts. Constructed from durable polycarbonate, it is suitable for various robotic applications, ensuring reliable performance and adaptability in design.