These are used widely in modern vehicles and it is safe to assume that your vehicle's wheels utilize one of these BCDs. Always check your owner's manual or call your local car dealership to confirm the bolt pattern on your vehicle. Wheels must be fitted with the correct type of lug nuts on their corresponding wheel studs. Lug nuts will have either flat, tapered (conical), or ball (radius) seats. The type of seat a wheel requires will determine the appropriate lug nuts required to securely attach the wheel to the vehicle. A flat seat type has a flat end that screws down the wheel stud to put pressure on the wheel and compress it against the mounting hub. Similarly, tapered and ball seat types have a tapered or conical end and a semicircular end respectively. A place to find the lug nut type is to check OEM (Original Equipment Manufacturer) specifications if you have stock wheels or contact the seller if you have aftermarket wheels. Some aftermarket wheels will only fit smaller lug nuts, or not allow an ordinary lug nut to be properly torqued down because a socket will not fit into the lug hole. Tuner lug nuts were created to solve this problem by utilizing a special key to allow removal and installation with standard lug wrench or socket. The design of tuner lug nuts can range from bit style to multisided or spline drive, and are sometimes lightweight for performance purposes. Another variation of lug nut is the "locking wheel nut", which is used as a theft prevention method to keep thieves from stealing a vehicle's wheels. When utilizing locking wheel nuts, one standard lug nut on each wheel is replaced with a nut that requires a unique key (typically a computer-designed, rounded star shape) to fit and remove the nut. This ensures that at least one lug nut will remain attached and, in theory, should prevent theft. However, universal removal tools are available which grip the head of the locking nut using a hardened left-hand thread. The success of locking wheel nuts depends on the determination of the would-be thief and the tools that they have available to them. The "offset" is the distance from the hub-mounting surface to the wheel's true centerline. It is measured in "mm" and can be either positive or negative. A positive offset means the hub-mounting surface is closer to the outside edge of the wheel, while a negative offset means the hub-mounting surface is closer to the inside edge of the wheel. A wheel with too little positive offset will be closer to edge of the fender.