Black Bull MD Barrier Extension KitIf you need to extend your existing Black Bull MD railing or have one of our straight MD starter kits or Corner MD starter kits, this extension kit includes everything you need to add length to your barrier. We have made it easy to order the right extension by allowing you to choose the length you need in a kit form that includes both the posts, railings and fixings. The MD railing Kit from Black Bull is a great way to protect machinery, supports,