The BulletProof Accessory Clamp was designed to make BulletProof accessories solid in your hitch. The clamp also helps to prevent theft by requiring the supplied offset wrench to remove your accessory. Installation is simple - drop the clamp behind the dual ball or accessory, tighten the bolt by hand, finish with the supplied offset wrench and all movement is eliminated! The BulletProof Accessory Clamp is compatible with these BulletProof accessories: Extreme Duty Shackle Attachment Single Tang Clevis Step Attachment Flag Holder Flat Plate Receiver Attachment Medium Duty Dual Ball Medium Duty Sway Control Dual Ball Heavy Duty Dual Ball Heavy Duty Sway Control Dual Ball *Not Compatible with our Pintle Attachment, Loop, Medium Duty Clevis, Heavy Duty Clevis, Medium Duty Weight Distibution Adapter or Heavy Duty Weight Distribution Adapter, Aluminum Hitches or Light Duty Hitches. *PATENT PENDING