Each is case hardened for maximum life and smooth operation at high RPM's. Corrosion resistant surface treatment to prevent corrosion and pitting over long term use or storage.This will add to the life as well the strength of the assembly. Top end of rod is bushed for oil retention and eliminates pin galling. The bottom end rod bores are case hardened to 58-62 RC to optimize bearing running surface. The crank pin bearings are manufactured from the highest quality, hot rolled steel case hardened to 58-62 RC to extend the lifetime of the assembly. Caged needle roller bearings to provide the highest possible RPM. Wiseco Complete Bottom End Crank Assembly & Gasket Kit (WPC119). Image may not be actual item and may differ depending on your vehicle fitment. Before purchasing aftermarket parts for your bike, please confirm that your vehicle has USA-specified parts. If this is the case, parts ordered from a USA retailer may not fit correctly. Compare the microfiche for the USA model to your model to be sure they are the same. Perf-moto is not responsible for fitment issues caused by non-USA models. Please make sure you know the rules of your country before purchasing. Our goal is provide you with the best and easiest internet purchasing experience. We are committed to providing a great online shopping experience. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle & Scooter Parts & Accessories\Engines & Engine Parts\Other Engine Parts". The seller is "perf-moto" and is located in this country: US. This item can be shipped worldwide.