Kaper II stainless steel center caps designed to conceal axle hubs while providing a stylish look to trailer wheels. Available in 5 lug (3. 19" center bore), 6 lug (3. 75" and 4. 25" center bores), and 8 lug (4. 90" center bore). The A-K-319-CNA design is completely enclosed on one end. The axle cover is a "Push-thru", the wheel must be removed and the cover pushes through from the back of the wheel.