This 3.74in push thru center caps and 1/2-20 lug nuts sets for 3.74in Bore 3.85in Tall trailer/truck/camping car rims. The wheel hub cap is made of carbon steel, which is highly strong and impact-resistant and can cope with complex road conditions.
These 95mm 3.74in trailer push through center caps with removable top caps are fit for 3.74in truck rims center bore, 4.41in tall. The function of the Top cap is to pump grease into the bearings without removing the entire hub from the axle.