Genuine Shimano HollowTech II bottom bracket assembly
Set includes left and right-hand cups, spacers, inner cover, and inner O-rings
Lightweight seal structure helps to remove vital grams
Sealed cups keep out dirt and water
Maintenance-free
Compatible with 68 mm and 73 mm shell
Durable anodised finish
Easy installation with TL-FC25 tool or TL-FC41 can be found here - https://www.evocycles.co.uk/shimano-tl-fc41-bb-chainring-tool/mpn:TLFC41/