Aluminum JK Crusher Flares are constructed using 1.5" X .188" wall annealed aluminum structural tubing as the outer "rub rail". This .188" wall tubing is thicker than the .120" wall tubing used in our steel Crusher Flares, to provide better resistance to crushing, kinking, and bending than competitors' aluminum flares made with .120" wall aluminum tubing. The foundation of the Crusher Flare is a CNC laser cut, 3/16" thick aluminum mounting plate, precision brake-formed to conform to the subtle curves of the JK's body panels. Mounting holes are countersunk for the use of flat-head stainless steel mounting hardware. The top plate is CNC laser cut 1/8" aluminum plate, which is hand formed around the curves of the Crusher Flare for a factory appearance that matches the JK's organic body lines better than any other aftermarket metal flare available.; Exclusive Inner Brace Set Every set of Poison Spyder JK Crusher Flares comes with a set of inner braces that tie the Crusher Flare in to the sturdier, heavier-gauge steel of the JK's inner body tub structure. Competitors' JK Flare products simply bolt directly to the outer layer of the JK's body sheet metal. But as any JK owner knows, the exterior sheet metal is very thin and flexible. Simply bolting a heavy duty fender directly to the exterior sheet metal without the inner bracing is a disaster waiting to happen. Regardless of how sturdy the flare is built, upon contact with rocks, trees, etc., it will simply push in and deform the flimsy sheet metal it is bolted to, possibly causing expensive and unsightly damage. The Inner Brace Set that comes with Poison Spyder Crusher Flares effectively bypasses the outer sheet metal, instead transferring those forces to the much stronger inner structure of the Jeep. That's why we've been able to demonstrate the strength of our flare attachment system by parking another Jeep on top of the Crusher Flare! These Inner Braces are CNC laser cut, brake-formed for a great fit and simple inst