X AUTOHAUX 2pcs 31mm x 9 Ball Bearings Cages Crank Bearings Wheel Bearing Retainer for Bicycle Crank Middle Shaft

This kind of ball bearing is with 9 stainless steel balls inlaid in the retainer design.It can be a better replacement for the mid axle axis bearing of racing bicycle or mountain bike.2 pieces included in this package.Specification: Color: Silver ToneMaterial: Stainless SteelBall Number: 9Ball Diameter: 4.7mm/0.19"Outer Diameter: 31mm/1.22"Inner Diameter: 22mm/0.87"Dimension: 5.7x31mm / 0.22"x1.22"(H*D)Notes: The size of this product is very important, please check it carefully before purchasing.Please allow 1-2mm differs due to manual measurement, thanks.Package Included: 2 x Bicycle Ball Bearings