AA Stage 1 Clutch Kit for 2020+ Defender HD10Aftermarket Assassins Stage 1 Clutch Kit For 2020+ Defender HD10 These Clutch Kits deliver a powerful impact! Strong and sustained performance from the clutch kits regardless of the terrain. Whether you're on the trail or at a race, you'll experience impressive acceleration and immediate clutch response when reapplying throttle after taking a corner! Features Adjustable helix for easy RPM adjustments Works well with tire sizes 27" to 33" and paddles