Designed for drag and road race use. The 6 Button Kwik-Lok incorporates six sintered copper pucks bonded and riveted to a heat-treated high carbon steel plate. The ridged hub is manufactured from high carbon steel. Twelve pucks (six per side), provide positive engagement, greater fatigue resistance and improved heat dissipation. Twelve pucks reduce initial strain on the drive train and provide a solid lock up once under way.