Shimano BB-UN300 BOTTOM BRACKET - STANDARD -SHIMANO quality/performance cartridge bearing square bottom bracket -Better chainline stability with chain line stabilizer -Series: Shimano Tourney TX800 Series -Fits JIS square-taper cranksets -Hollow spindle -w/o fixing bolts -Adapter material: Aluminum. 1009904(014-023)4/8 1 52323(10:5/25/23:ARI 60523(20:6/7/23:ari---1:RTN ON 6/8/23 61923(20:8/03/23:ARRI 82423(20:11/03/23:ari