RAM Clutches 98793HDT Powergrip Clutch Set is designed for Street and Competition performance up to 650-Horsepower RAM Clutches Powergrip HD is a true Strip/Street Competition Clutch System that can handle the rigors of weekend racing and spirited street driving. This Powergrip HD Clutch System has the same components as Standard Powergrip with the exception that the Disc Friction Surfaces are both Sintered Iron. Sintered Iron provides a degree of slippage on vehicle launch to prevent the violent and uncontrollable engagement characteristics Of Paddle Type Metallic Discs. This firm consistent engagement is easy to control. Some chatter is likely on engagement with rear gearing less than 3.73 In Street Applications. Each set includes The Pressure Plate, Clutch Disc, Release Bearing, and Alignment Tool unless otherwise noted. Use Powergrip HD for power levels to 650-Horsepower, or lower powered vehicles that see frequent track duty. RAM Clutches are the Champions Choice.