Stainless Steel replacement Accu-lube dust cap for boat or utility trailers. This dust cap is used if your axle is an Accu-lube or EZ Lube axle with a grease fitting on the tip of the spindle. Rubber plug easily removes to access your grease fitting. This dust cap measures 2.441 inches across and will fit most 6 bolt trailer hubs.  Drive in installation ensures a tight fitment in your hub. These Stainless Steel 2.441 Accu-Lube Grease Caps Fit very Snugly, so installation with a heavy hammer, mini sledge, and a 2.441 Trailer Dust Cap installation Tool for 2.441 Boat Trailer Dust Caps is highly recommended.