6. Here is what Pro Comp's design engineer shared with us to convince us that, in this specific case, single shear would do just fine. From front to back: final zinc-coated production part; raw, uncoated part after machining; and a solid billet of hot-rolled 4140 2-inch steel round stock. As 4140 is a very expensive metal, this is about as tough as steel gets without being ultra-pricey. We agreed that the use of this super-high-grade material would suffice to mount a pair of coilover shocks in the intended manner for this particular application. However, we kept a close eye on this during our evaluation.