Accessories:2x10 Steel Pin-4PCS2x5 Stainless Steel Cap Head Screw-4PCSManual number:8356Product major function & usage:Connect axle and wheelsMajor advantages of upgrading to this product:Made with aluminum durable 6061 T6 material, our special design for the hex to install tightly on the axle.The features of general appearance of this product:Made with aluminum durable 6061 T6 material, our special design for the hex to install tightly on the axle.Other special notes and comments:Thickness of original brake disk : 6.8mmThickness of hex : 9mm