R.E. Thomas Piranha Dual Line Cutters. Help protect your boat's propeller and running gear from catastrophic failure due to entanglement in marine debris, kelp, and other nuisances. They feature twice the cutting surface area of conventional line cutters offering you redundancy and a prolonged life span. The Piranha's split design allows for easy installation (< 10 mins) and is an excellent alternative to "scissor" style line cutters that are less robust, difficult to install, and require more maintenance.