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Features: brand new and high quality 1 40-32mmm, inside diameter 32mm, outer diameter 40mm, steel ball diameter 4mm, commonly used in and Road motorcycle front fork headset 2 37-29mm, inside diameter 29mm, outer diameter 37mm, metallic ball diameter 4mm, commonly used in normal bicycle entrance fork headset three 38-24mm, internal diameter 24mm, outer diameter 38mm, steel ball diameter 8mm, commonly utilized in children&;s bicycles four 31-22mm, inside diameter 22mm, outer diameter 31mm, metal ball 4, used for Bottom Bracket five 29-22mm, inner diameter 22mm, outer diameter 29mm, metallic ball diameter 6, normal bottom bracket for sale 6 25mm, outer diameter 25mm, steel ball diameter 6, often used in rear hub 7 21mm, outer diameter 21mm, steel ball diameter 4, usally utilized in front hub Specification: Material: Steel Quantity: 2PCS The kit includes: 2x bearing