Features: 1.Made of aluminum alloy material, high strength, corrosion-resistant, sturdy and durable. 2.Lightweight, easy to install and use. 3.Distribute the pressure of the nut over the part being secured, reducing the chance of damage to the part. 4.3 different color for you to chose, meet different needs. 5.Wonderful accessory for bike chainwheel. Specifications: Item type: Axis Screw Nut Material: Aluminum Alloy Weight: Approx. 25g Optional Color: red, black, golden Diameter: Approx. 18mm/0.7in Type: 18mm Scope of application: Integral chainwheel Remarks: Applicable to integrated hollow chainwheel Hexagon socket: 10mm wrench Packing List: 3 x Axis Screw Nut chainwheel Note: Chainwheel screw diameter has 18mm/20mm, FC-4500 and FC-5600 road chainwheel FSA chainwheel is 18mm. For SHIMANO 590 596 XT XTR SLX integral chainwheel is 20MM.

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