#BNT5021 Shimano Roller Clutch Bearing. This Bearing is 10 X 17 X 8 mm. Please check the schematics for your reel for the correct part number. A good source if you don’t have one is www.reelschematics.com. Most of the time, these can just be pressed in by hand. You will need to test the direction of rotation before installation. The bearing looks nearly the same from both ends! Need more information? Just send us an email!