Needle Roller Cages for general usage are bearings, which display excellent rotational performance. Since they have a large lubricant holding capacity, lightweight and high rigidity, they can withstand severe operating conditions such as high-speed rotation and shock loads, and they are used in wide range of applications. Available in Sizes From Bore size: 3 mm to 200 mm Series: KT (K), KTW (K...ZW) KTZ & KTV used for Engines available in Big and Small ends.