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Free Ground Shipping. Ancra Silvercap Overdrive Ratcheting Cap, 1 pack.Convert any winch into a ratcheting winch by adding Ancra’s OverDrive Ratcheting Cap. The lubricated cap with a Grime Guard Weather-Tight Seal fits over the existing winch cap without having to remove the winch from the trailer, making it faster than conventional winches. Your winch bar stays in the winch until your straps are tight. Ancra’s OverDrive® is the easy upgrade for winches. With a ratcheting winch, you work faster because the winch bar stays in the winch until the strap is tight. To install on any existing winch: 1. Simply slide the OverDrive unit over the cap of the old winch. 2. Spin it in place. 3. Secure it with the bolt. It's that simple. All necessary parts are included.