These are the patented design McGard Spline Drive lugs. Non-hex wheel lug which is both a light weight lug with more gripping surface area than the stock lug (to prevent lossening up under load), and a wheel lock. An RX8 takes 20 of these and ordering one of these kits includes 20 spline lugs and one tool. If you look really close at the picture above you can actually see the two piece nature of this lug by looking into the lug at the bottom of the picture. The part that touches the wheel (the "seat") stops turning and a bearing between that little ring and the rest of the lug allows the outer part of the lug to keep turning. What this means for you is that the lugs are not grinding against the surface of your nice new wheels and these lugs go on much smoother than any other lug choice. If you ask what is on our Mazdas here...this is the choice.
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