The GTR203020 is a Full Complement Open Type, Double Row Machined Needle Roller Bearing with an oil groove and oil hole in the Outer Ring. The Full Complement Guide Type Bearings have no Roller Cage and use mallet-shaped Rollers which are accurately guided by the Guide Rail at the centre of the Outer Ring Raceway and by the Guide Groove of the Rollers. 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 it isn't affected by assembling an Inner Ring with the shaft. In caged Needle Roller Bearings like this one, the Needles are precisely guided by the Cage to achieve ideal load distribution. These Bearings are designed for high load carrying capacity in radially compact arrangements and are used in most general purpose applications. The Bearing's dimensions are 20X30X20mm.