Quick Trim Trailer Hub Cover Phoenix USA Fits 5 Lug 4-1/2" Bolt Pattern Wheel

This trailer hub cover cap offers a quick, economical way to do a makeover on your trailer wheels. Quick and easy snap-on (push-on) installation; this center cap snaps right on over the lugs on your trailer wheel. This Phoenix USA part # QT545CHS, fits over the half inch sized lug nuts...just push it on! Brilliant chrome finish ABS centercap with an overall edge to edge diameter of 6-3/8 inch. These trailer hub caps are for steel wheels with 5 lug nuts and 4½ inch bolt pattern wheels. How do I figure this out?.