I picked up a used Toyota Tundra with custom fuel wheels and that was my introduction to "tuners" or spline nuts. When I looked for the wrench on the rig, nobody was there. After digging around the internet I found out the nuts for the tuner/splines. I ordered a different Allen key which I thought would fit. Too small; It turns out there are several sizes and different numbers of splines for these tuner/spline nuts. Good luck finding the right one! I then stumbled across this product with a picture of a digital caliper and measured my nuts with the same tool. This socket is perfect. Kudos to Circuit Performance and Next Level Motoring for having the sense to include a caliper gauge image.
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