Scotty 3134 Downrigger Security System 3-Piece Locking Plates w/o Padlocks 
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3134 Downrigger Security System 3-Piece Locking Plate Without Padlocks
Works in conjuction with your existing mounting knobs and padlocks of your choice. Works with all Scotty tilt-up Electric and Manual downriggers. Manufactured using rugged fiber reinforced engineering grade nylon molded over a robust stainless steel plate.
*Padlocks not included.
This system provides a degree of protection for your Scotty Downrigger and Swivel Mount. It is NOT designed to and will not stop a determined and equipped thief.