B&B Manufacturing provides fast and economical production of timing pulleys for custom and prototype applications. That means whether you have a unique need that can't be met with standard pulleys or require a quickly machined pulley for a low-risk, high reward prototype, we're here to help. We stock lengths up to 12 in, but can accommodate longer lengths and custom tooth counts. B&B Manufacturing Powerhouse™ Timing Pulley Bar Stock, 9.8 mm Outside Dia, 10.4 mm, 13 Grooves, 2.5 mm Pitch, 0.437 in Hub Dia, 75 mm Overall Length, Aluminum