Feature: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 ball bearing retainer with 9 balls, which suitable for 33.5mm inner diameter head parts.Before purchasing, please confirm whether the size of the accessories of your bike is matched with this product.Description:Outer Diameter: 44mm / 1.73"Inner Diameter: 33.5mm / 1.32"Color: Silver ToneMaterial: SteelNumber of steel balls: 9Dimension: 8.6x44mm / 0.34"x1.73"(H*Max.D)Notes:Please allow 1-2mm difference due to manual measurement. Package Included:12 x Bicycle Ball Bearings.