I wrench on my barkbusters after every race. And I tighten the heck outta them. But when you hit trees like me they just keep on getting knocked outta allignment. Eventually the hex head will get buggered up. You go to the hardware store and they only have soft bolts. Well here's a replacement pack with hardened hex bolts. Locktite-em, tighten the heck outta them, and your off to the races. Great Product!