eMagTech 10PCS Bicycle Ball Bearing Cycling Headset with 20 Balls Steering Bearings for Mountain Bicycles Fixed Gear Bike Crank Bottom Bracket Replacement Parts

Outer diameter: 40mm/1.57in, ball diameter: 4mm/0.15in. Please confirm the size matches your bicycle bearing frame before purchasing. Widely used: Fit for mountain bicycles and fixed gear bike. Function: This ball bearing inlaid in the retainer design, it is a bicycle parts. Used for replacing the bicycle crank bearing. Material: Made of metal, strong and durable, it can use for a long time. What you get: You will recceived 10 pieces of bicycle front fork balls bearings to meet your daily needs.