The TB20H100 Timing Pulley by Cross and Morse is designed to work with a 1210 Bush bearing and is specifically made to hold a 1" belt with 20 teeth. This high-quality timing pulley is ideal for use in industrial automation and motion control systems, ensuring precise and efficient power transmission. With its durable construction and reliable brand reputation, this timing pulley is a crucial component for any machinery or equipment requiring accurate timing and performance.