Wesmar's two-bolt design was created for an easy drop-in installation. The new stainless steel bow and stern thrusters can also fit on competitive two-bolt metric systems. Also simplifying the installation process, Wesmar has developed a new stern tunnel for a more efficient upgrade. In addition to its retrofitable design, Wesmar is escalating the horse power of their bow and stern thrusters with a dramatic new design that increases power from eight to 13 horse power. Now, thanks to the new high tech design, boat owners and captains alike can achieve more thrust through the same sized tunnel.