I ordered these to fit my 2016 F150 Lariat 4x4. I am so impressed with these nuts and they are a billion times better than 2 piece failed Ford OEM parts with caps that fail miserably as shown in the pictures. Get them and do yourself a favor. If, like me, you change tires every 5,000 miles at an oil change, you're going to want them on your car. Well as many others have said they are one piece and are 21mm or 13/16. So make sure you know this and have the correct slot to change a tire if you have a flat tire ALSO tell your mechanic they aren't OEM they are 22mm. Sorry for the dirty tire pics, we just got back from a moose hunt and I didn't wash my truck. So glad I didn't have an apartment otherwise I would have screwed on the original nuts. In the first picture you can see from left to right the original nut, then the other one from which I had to remove the defective cap, and then the new iron. Amazing difference and quality with irons. They are a bit longer but fit great as you can see from the photos and look good on rims and tires.