This is set of spline drive tuner lug nugts for your new aftermarket wheels. The thin spline drive design is ideal for small diameter lug holes found on aftermarket wheels. They feature a closed end design, more gripping power, a larger seating surface and extended stud engagement. Don't risk scratching your new wheels! The thin walled key adapter tool protects the wheel's surface, and also adds an additional layer of security, deterring would-be wheel thieves. DO NOT USE POWER TOOL WITH THIS SET OF LUGS.