CE Smith Dust Caps - Hub ID 1.980" - (Pair). Product Description. Use this dust cap to protect your axle nut.. Features:. Fits hub with inner diamerter of 1.98". Sold in pairs. WARNING: This product can expose you to chemicals including LEAD,Chromium (hexavalent compounds) which are known to the State of California to cause cancer, birth defects or other reproductive harm, and NICKEL (METALLIC),COBALT METAL POWDER,BERYLLIUM which are known to the State of California to cause cancer, and ARSENIC ,CADMIUM which are known to the State of California to cause cancer or other reproductive harm. For more information go to P65Warnings.ca.gov.