Stainless Steel replacement dust cap for boat or utility trailers using the E-Z Lube or Accu-Lube Greasing system. This dust cap is used if your axle is an axle with a grease fitting on the tip of the spindle. Rubber plug easily removes to access your grease fitting this dust cap measures 1.98” across and will fit most 4 and 5 bolt trailer hubs. Drive in installation ensures a tight fitment in your hub. It is recommended to use 1.98 Trailer Dust Cap installation Tool when installing these Stainless Steel Dust Caps in conjunction with a Heavy Hammer. These Stainless Steel Dust Caps fit extremely tight into the outer face of the Hub. Using the Tool and Heavy Hammer will ensure successful installation.