4pcs Steel Ball Bearing Retainer 4/5" x 7 Balls for Bicycle Crank

4 pieces crank bearing. This kind of ball bearing stainless steel ball inlaid in the retainer design.Can be a ideal replacement for the bicycle or racing bicycle or mountain bike.This beads rack for bike parts replacement,suitable for bike crank, bicycle crank. Easy to install without instructions.This ball bearing retainer made of steel, high quality, durable and high intensity,can be used for long time.This ball bearing retainer with 7 balls, 20.5mm outer diameter, which suitable for 13.5mm inner diameter head parts.Before purchasing, please confirm whether the size of the accessories of your bike is matched with this product.