Below are some measurements taken of this cap, This cap is fairly standard for 5 lug trailer wheels and is a longer version of CCS001.
Fits trailer wheels with 3.18" - 3.30" center holes. The Depth of this cap is: 4" The Inside Diameter of the cap at the base is 3 1/2" The Outside Diameter of the cap at the base, Including the lip, Measures: 4" The Outside Diameter of the cap at the base, NOT including the lip, Measures: 3-3/4 inches
Give your trailer wheels a new look with this 3.19" diameter open ended stainless steel center cap. This versatile design gives you optional access to grease points in the wheel. With this cap you simply remove the snap in cap to grease your hub. You no longer will have to remove your trailer wheel to grease your hubs. This cap is designed longer to fit over grease bearings but will not fit over every application so be sure to take the proper measurements. Above pricing is for one stainless steel center cap.