Front upper arm is caster and camber adjustable. Double bump stops are optimized for our upcoming billet knuckle. Super steering angle clearance. Made of DOM tube, 1/8" wall. Tig welded and powdercoated. Clamping rod end receivers, forged rod ends with PTFE lined maintenance free, low torque spherical bearings. CrMo bearing side spacers. Compatible with OEM and aftermarket knuckle ball joint tapers. This is the same arm we use in Formula Drift on Matt Field's Falken Tire C6 #DriftVette