Mammoth Concrete In Motorcycle Ground Anchor The Mammoth Concrete In Motorcycle Ground Anchor is a great choice for any rider looking to provide a secure home for their bike. Delivering the all important pivot point for a chain and other security gear, add an extra layer of safety to your protection. A rotating head section provides much needed versatility and allows the use of the motorcycle ground anchor even in enclosed locations. Motorcycle Ground Anchor Features: Manufactured from hardened steel. Rotating head section allows optimum access for chain and ease of use. Suitable for outdoor and indoor use.