Scorpion Low-Profile Clutch Assembly With Lock-UpFeatures a redesigned billet aluminum lock-up pressure plate designed to fit under the stock primary coverSurface area is greatly increased and lever effort is kept to a minimumLow profile designThree different coil spring sets included to provide a wide variety of spring pressure options, allowing you to tune the clutch for stock to 200+ HP applications Bolt on, no modifications requiredSteel inner hub with bearing is also included to complete the unitBillet aluminum pressure plateAdjustable pressure arms increase spring pressure as rpm increaseCan be run wet or drySmooth, precise shiftingComes assembled with bearing includedMade in the USADerby cover spacer #686-30-16100 is required. The spacer plate is NOT required if using Barnett derby cover #343-30-43015/343-30-44015.