A thief can steal your lower unit in minutes. Protect yourself with the Panther tamper resistant Lower Unit Lock kit. 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 to prevent rust and corrosion.Yamaha Single- 25" Shaft, Short Bolt Up to 150 hp