TBS ACCESSORY BBC PULLEYS Each 6 Rib style pulley is meant to hold a 6 Rib style belt. Depending on your application, these belts could be used for air conditioning, alternator, power steering, etc. Machined from 6061 Billet Aluminum Hard Anodized (Marine Pulleys Only) Hardware Included **Black anodizing available upon request. Special order, please call for details. **