Panther Security Systems is an assortment of locks for boaters’ different needs. We offer all-new Lower Unit Locks which ensure your lower unit will be Tamper-Resistant. We also offer two turnbuckle locks with different strengths and finishes. In addition, we have a lock that mounts on a transom bolt up to 1/2 in (12mm) and is drill resistant. Is your boat engine’s lower unit safe from theft? Don’t be fooled, a thief can steal your lower unit in minutes. Protect yourself with The Panther Security Systems’ New Tamper-Resistant Lower Unit Lock Kits. These tamper-resistant bolts and nuts replace your existing lower unit bolt(s) and nut. Both require the unique Tamper Resistant Tool to install and remove. Each with a unique pin configuration to deter even a professional thief. The high strength Bell Washer protects against utilizing any other clamping device to remove the Bolt and/or Nut, deterring the boldest of thieves. Available in single, twin and triple engine configurations. Constructed of marine grade Stainless Steel for strength and corrosion resistance