The C.E. Smith 8 inch keel roller with 5/8 inch center is a durable and high-quality boat trailer part designed for smooth towing and protection of your boat's keel. Made in the United States by C.E. Smith, this product is specifically manufactured with a 5/8 inch center for easy and secure attachment to your trailer. With no modifications required and no warranty offered, this keel roller is a reliable and essential accessory for any boat trailer.