Mild steel is not stronger and the breaking or bending of that material is not as good as the D. Any reputable Shop that manufactures cages will not use MILD STEEL to make cages. Builders use Mild steel to cut on cost, any reputable builders will not do this and they will build roll cages out of D. This cage has Rear whip Tab mounts and factory door hinge mounts welded. Welded Door Hinges Factory Location.2 Whip Tabs on Rear. The item "Polaris RZR XP1000 / Turbo 4 Seat Radius Roll Cage Heavy Duty UTV Wolfpack Black" is in sale since Monday, May 6, 2019. This item is in the category "eBay Motors\Parts & Accessories\ATV, Side-by-Side & UTV Parts & Accessories\Brakes & Suspension\A-arms". The seller is "jason18cars" and is located in Santa Ana, California. This item can be shipped to United States.