Looking for a tough, no-nonsense keel roller that won’t back down? Meet the IMGRAY150 – 6" Grey Dog Bone Keel Roller. Made from solid grey nylon plastic, this roller is ready to take the weight and roll with it, all while protecting your boat’s keel from wear and tear. The dog bone shape provides natural centering support for your boat during launching and retrieval, keeping it aligned on the trailer. With a 17mm bore to suit 16mm spindles, it's a standard 6" size that's perfect for most setups. And yep — it's UV-stable and built for Aussie conditions. It doesn’t shout, it doesn’t shine — but it rolls like a champ and holds your boat with confidence.