The tr304425 offers a strong construction open type, Single row machined needle roller bearing with an oil groove and oil hole in the outer ring. This bearing has no inner ring, Meaning the needle rollers are mounted directly onto the shaft. As such, The bearing has better running accuracy as presentedn t affected by assembling an inner ring with the shaft. In caged bearings featuring needle-like rollers like this one, The needles are precisely guided by the cage to achieve ideal load distribution. These bearings are engineered for high maximum load handling ability in radially compact arrangements and serve as tools for in most general purpose applications. The size details regarding the bearing include 30x44x25mm.