The spline drive design provides a secure fit and prevents the lug nuts from becoming loose over time. The 1/2x20 thread size is perfect for my Dodge Dakota, and the 1.4-inch length fits my wheels perfectly. Additionally, the closed-end design prevents dirt and debris from getting inside the lug nuts, which can cause rust and damage over time. The cone acorn taper seat ensures that the lug nuts seat properly on the wheels and do not cause any vibrations or noise while driving. The included socket key tool is also a plus because it makes installation and removal of the lug nuts easy and hassle-free. Overall, I highly recommend the 24Pcs Black Spline Drive Lug Nuts to anyone who is looking for a high-quality and stylish set of lug nuts for their Dodge Dakota, Durango, or Viper. They are easy to install, provide a secure fit, and look great on any vehicle.