Hi-Hat ClutchImproved stability due to built-in clamp Washer and felts included Rapid Lock SuperGrip Clutch Rapid Lock Super Grip Clutch HCL-205QR The H-2050 features our new Rapid Lock SuperGrip Clutch with slip-proof system. It features a patented 360° lock nut that provides vice-like clamping force for super grip. U.S. Patent #93556725