There are two styles of Bow Mount Locks.
The first style replaces the factory knob in the mount. The lock allows you to make height adjustments as you normally would but with the turn of a key the mount is locked securing the motor inside. This lock allows you to remove and reinstall the motor for storage and repairs easily without special tools.
These models include:
MKA-EDGE Fits Minn Kota® Models Edge, Riptide Edge & Pontoon Hand Control Mount
MG21 Fits MotorGuide® Models x3 & x5 Fresh and Salt Water
GHOST Fits Lowrance® Ghost
The second style is a unique locking knob that replaces the single cap screw that allows you to remove the motor from the mount. It adds security for your trolling motors while you are away from the boat and allows you to remove and reinstall the motor for storage and repairs easily without special tools.
These models include:
MKA-ULTREX Fits Minn Kota® Ultrex and Ultrex QUEST
MKA-FORTREX Fits Minn Kota® Fortrex, Riptide Fortrex