The skids are made with quality steel, very sturdy and will do the trick. Lack of instructions were offset by the airhead candy in the box!
I love the fact that my lower shock towers have an option to be protected now…. These 589 Shock skids are built well!  A few improvements could be made however in my opinion:
1) The bolt face hangs well beyond the skid (when tightening it seems as if some holding strength is sacrificed).  I’ll try to show in the photo what I mean.
2) There is about a half of an inch (before tightening) that actually bends and tweaks the skid sides inward as the shock bolts are torqued…. I’m not sure if this is a Silverado ZR2 issue, or part of the design.  Either way, I like them—and will keep them installed and be happy…
Awesome product, awesome company. Product is well made, designed, and fits fantastic. Would recommend these guards to anyone.