X AUTOHAUX 4 Pcs 4.76mm x 7 Ball Bearings Cages Crank Bearings Wheel Bearing Retainer for Bicycle

[Material] : This ball bearing retainer made of steel, , durable and high intensity., [Item Size] : Outer Diameter 20.4mm/0.8"; Inner Diameter 12mm/0.47". Package Included: 4 x Bicycle Ball Bearings., [Item Feature] : This ball bearing retainer with 7 balls, which suitable for 12mm inner diameter head parts.It is an ideal replacement for you bike., [Application] : This kind of beads rack stainless steel ball inlaid in the retainer design. It's suitable for replacing the crank bearing of the bicycle. suitable for ordinary bicycles, mountain bikes, lowrider bikes, stretch bicycles., [Notice] : Before purchasing, please confirm whether the size of the accessories of your bike is matched with this bearing cages.